It's not normal, no, We had a screen addicted child like this in our extended family. It was absolutely down to terrible, negligent parenting.
All started because they never wanted their kids to cry. They had a policy of never saying "no, you can't" and they couldn't bear the idea of their kids being unhappy for even a second. So they'd give then whatever they wanted. I can remember this particular child eating 8 yogurts in a row (to "keep them happy and shut them up") when they were about 2.
By 5 they were glued to screens.
At 7, they had no bed time (neither did their siblings). The adults would go to bed first and the kids would go when they felt like it. They'd be awake most of the night, playing xbox live with adult men in the USA. Tickets would be bought for theme parks, holidays of a lifetime (Disney/Universal/Legoland etc) and they'd refuse to go because they'd rather be playing on the xbox or ipad and one adult would always have to stay home too, so missed out. In the event they did get out to a theme park, they'd sulk and moan and throw a tantrum until they were taken home, even at 14 years old. On the one holiday they were banned from taking their gadgets, they somehow managed to buy a second hand xbox (that would only work in that country) off their birthday/holiday money with only 3 days of the holiday left. "Their money, their choice".
They decided at 7 that the only bed they could possibly sleep in was their parents' kingsize. There was only one room big enough for a kingsize. So their parents were turfed out of their bedroom. One slept on the sofa for years, the other in a twin bed in the child's room. Both parents 6ft tall or thereabouts and wracked with physical pain from their jobs and various ailments. The child then tried this with their disabled grandparents when they were staying. Called them evil and weird (even though they bought the child a king airbed!) and threw a tantrum for saying no, openly mocking them about it for years. Limited contact with grandparents and uncles/aunts/cousins due to concerns about the kids behaviour being ignored or resulting in verbal abuse towards the relatives.
This particular kid had hardly any friends (one, I think). Was allowed to eat absolute crap and get obese (diet was basically chips, chocolate, bread, pancakes and full sugar fizzy drinks all day, everyday). Never played out or went to the park. As an older teenager accidentally set the house on fire, because they were busy playing xbox and forgot their dinner was on the stove while home alone. Continued playing xbox while there was a burglar in the house when they were home alone, let them steal 1000s of pounds of other stuff and basically just ignored the man nicking stuff because they were "too busy to deal with it".
As time went on - Didn't have any romantic/sexual relationships, no friends. Rude demeanour, no social skills. Awful personal hygiene.
They're now an adult. Had a failed attempt at uni as couldn't survive independently. Now still living at home, taking classes, working a very menial badly paid job very part-time. No friends. No romantic relationships. Obese. Bad hygiene. Just a very small, lonely, sad life.
Not ND. Just really, really neglected by parents with no skills.
Their siblings are worse...tik tok addicted self obsessed adults with no jobs or education who have never left home but can't stop popping out babies who are themselves by age 1 already obese due to being weaned on junk food, addicted to screens and largely "parented" by their useless grandparents. So the cycle continues.
It's only now the kids are in their 20s and unable to live independently, making poor choices and making the parents uncomfortable in their own home, that the parents are beginning to think they went wrong somewhere. For years, anyone who tried to show even the gentlest concern was written off as "old fashioned", "boring", "up-tight" and we were told this was just modern parenting and we needed to get with the times.
I consider it to be the worst case of child neglect I have seen first hand in a 20+ career in education. They destroyed those beautiful kids' chances of being fully functional adults and essentially made them outcasts as none of their peers wanted to be friends with them and no employer will put up with them. They are also all very arrogant, rude and self centred, so as a result even close family have went NC.
I sincerely hope the parents of this 5 year old wake up before she loses out on her childhood too. Unlimited screen time and addictive behaviour at 5 is a very bad sign for her future.