Yeah, he exists BUT..... it's really impossible to tell his true level because a kid that age likely plays in 1 area and not all over the place. An accurate rating is only achieved by traveling and playing a lot of players in different areas. He could be playing the same players that think it's cute seeing someone so young playing tournaments AND THEY MIGHT NOT BE TRYING THEIR BEST and inflating his rating.
a three year old is better than you at chess


hes 4 cause he was born on Jan 2021

and you
not really he is not higher rated than me but 1600 in fide at age 3 is mind blowing
Is there any proof that such a kid exists?
Yes it is.And the fact that you haven't heard about him is concerning
I'd knock him all around the board. I'd make him cry & quit chess.