You're the only one that fundamentally misunderstands why and when people praise Marner, to the point that you're creating conspiracy theories out of nothing to sustain your narrative. Marner being an amazing player is the actual point, and praise comes from all sorts of people - both with and without incentive to see him do well - and through all sorts of situations - good, bad, and everything in between. Even when there's no more hockey to even be played. In fact, if there's any time it happens the most, it's in response to people spreading falsehoods about him, much like you are now.
Back to the original point, Treliving and Berube explicitly said they wanted to re-sign Marner. You were wrong.
No, it's valid criticism. He fumbled this badly.
Marner has played a part, but he's not the one to blame for where we are. Marner's primary responsibility is to do what's best for him and his family. It is the responsibility of the GM to do what's best for the team, and ensure things don't get to this stage, and Treliving has failed.