"Is this any different or better than children attending private school?"
My son did his A-levels at a comprehensive.
There were 27 people in his further maths class. His teacher was 72, and had cognitive issues from a bad bout of COVID. He regularly missed classes because of ill health, and the school often wouldn't be able to find anyone to cover, so my son spent a lot of time just working alone online.
His physics class struggled to get lab time - the school had taken on so many additional pupils to make up for funding cuts, that kids were being taught in tents in the car park. Access to the labs was very difficult because of school overcrowding, and the labs were poorly equipped.
Son had 1 hour of online tutoring once a week.
He did well at A level and went off to university to study engineering. His girlfriend who is also an engineering student who he met when he started his course went to a top private girls' school. She did Further Maths A level in a class of 6. The school has state of the art lab facilities.
I think suggesting that state school pupils who have even an hour of tutoring in every subject once a week are no worse off than kids in private schools (who also often have private tutoring in addition to being at private school) is deranged.
Class sizes in private schools are literally half or less on average than classes in state schools. Children get vastly more individual attention in every lesson, every day.
And the objection to private schools isn't an objection to parents wanting to do the best they can for their children. It's an acknowledgement of outrageous inequality of opportunity and elitism in our education system, which is unfair to children and morally indefensible as a system.