Dewaine, Dwane, Dwain are all instantly recognizable and straightforward to pronounce.
But Dwyane?
As in Wyoming?
I think you are making the man’s point.
I’m not a huge NBA fan but I know there’s no Heat player who pronounces his name Dwy-ane.
He was stuck up on the “wayne” vs. “wyane” part. My point is that we all can pronounce ‘w’, y is almost always silent before a vowel, and the ‘ane’ part should be self-explanatory.