It's in the comments of one of his videos. He was asked about it and said:
Oh my gosh!!!! This takes so much mystery away from the announcer! I don't know how I feel about this!
Now I want to know who the announcers were for the past games
I do think I like this one the best, though. I love the way he says Link. Some are a little lackluster, though. Jigglypuff, Greninja are too boring when he says their names, imo. A few others, too. I think I like the way King Dedede is spoken in Brawl better than Smash 4, as well.