There’s nothing at all to worry about, he sounds like a delightful little boy. He’ll have had all his developmental checks so any physical problem would have come to light.
Please don’t start trying to force him to do what he’s not ready to do by hauling him to his feet or making an issue of it. And don’t take any notice of negative comments from “concerned” non-medical people.
My DD1 didn’t walk till she was nearly two and a half, but used to get round as quickly as any walker on her bum. DD2 was only 17 months younger, so it was a bit of a toss up as to who would walk first.
Then one day DD1 just stood up and walked as confidently as any other child of her age.
Interestingly, DD1 was a very early talker too, and was a bit of a star at toddler group where I’d find the volunteer helpers gathered round her being highly entertained by the grown up conversation she’d have with them.