Come on, he can have his opinion, he has the right to talk and debate about BOTW like all of us did. Why because he's a game developper, it makes his opinion irrelevant? To me it's the opposite. So the problem is because he disliked the game?
I play Zelda since the GB, Zelda Link's Awakening (never had a NES, my familly disliked video games), played all the Zelda games since then and absolutly loved all of them, one of my favorite series. I even bought a Switch just to play the "real experience" of BOTW, even though I had a Wii U and I'm not interested into Mario Kart, Arms, Splatoon, etc. So yes, I love Zelda.
But BOTW disappointed me in almost every way, I don't wanna give the many reasons here again, but if I had to score it to summary my opinion, I'd give it a 7-7.5/10. I'd give to all the other Zelda canon games a 10/10 or a 9/10, maybe a 8/10 for the 2 DS games.
The point is, if even I, a Zelda fan didn't 100% liked BOTW, it's possible than other people do... Included mr Blow here.
And come on the personal attacks because someone disliked your game, if anyone who is doing those attacks is more than 16yo, you're morrons, honestly.