Not closed. He wasn't asked anything about his coach. What he said was spontaneous, without prompting. It's at least as likely he really meant it as it is that he was trying to butter up his coach for more playing time. He didn't have to say anything at all about the coach because he wasn't asked.
It sure seems like a lot of people want to completely disregard any possibility that, you know, Konecny might have meant what he said. As for your point that it's against their interest to do anything but praise, see what I wrote above.
I know that "fan" is short for "fanatic," but it really is fascinating how fans are drawn to all-or-nothing extremes when it comes to evaluating teams, players, and coaches. It's just like politics, which is why I posted this article the other day (it's a great read):
"Motivated ignorance" is ruining our political discourse
Sometimes there is a middle ground with things. And people want to label me a "Hakstol lover" simply because I take a middle ground with him and don't bash him across the board. It's because of the human psychological element of wanting to paint anything that doesn't 100% correlate with your own opinions as, essentially, evil.