maybe, maybe not.
when h264 was introduced (Aug 2004), even intel had HW encoding for it with sandybridge in 2011. nvidia had at 2012
so less than 7 years.
av1 was first introduced 7 years ago and for at least two years android TVs require HW decoding for it.
And AMD rdna2 had the same 4 years ago.
so from introduction to hardware decoding it took 3 years.
I have no idea why 10 years is thrown around.
and av1 had to compete with h264 and h265 both. ( they had to decide if it was worth implementing it)