Oh I don't know what xinyi should be like, period
And FWIW I think Mr. Su's xingyi looks really weird.
But yes his credentials (in inverse quotations...?) are undeniable, and I'm impressed by them.
Without knowing much about your teacher, I'd say Mr. Su's has the most experience of the two. Would Yang Hai concede to Su Dongchen or vice versa? I think the former.
No disrespect to Yang Hai, because I truly think he's awesome as well.
All I'm saying is that what Mr. Su does is worth a second look, by any martial artist, regardless of style. He has more than proved himself, and it doesn't matter two shits what his form looks like, no?