Feeding a toddler in front of a tv can go one of two ways.
1 he is able to sit at the table for longer as hems. It bored so will eventually eat a decent amount (and you can feed them easier if that's required)
2 he gets caught up in the tv and forgets to eat completely (but you still might be able to sneak some spoon fulls to him.
And, it can change over time which one is your DC.
Do whatever works for you. If it helps him to have your company at the table, try to find something you can do at the table, even if it's just a crossword.
Make sure the food has a good amount of calories in it so that if he eats less he's still getting benefit from it. Maybe give him some children's vitamins to ensure he is covered nutritionally.
Some children will grow out of it, others won't.
If not letting you feed him is unusual, then hopefully it's just him being under the weather, it's a common enough thing.
As long as he is getting enough calories and nutrients, whether eating on his own or being fed by you, and topped up with some vitamins.
DS1 who was my problem eater as a toddler, now as a teenager it's clear he has autism and still has a LOT of food issues/quirks but within the range of food he likes and will eat, eats well.
Neither DS really liked their food being mixed, they prefer each vegetable on its own (once I get them to eat them - a battle of extraordinary magnitude!) so things like pies, casseroles and soups are a non starter with them.
If I hid veg in something it had to be really well hidden, eg puréed in some mince.
What can work for one child doesn't always work for another.