There is a difference between criticizing (giving a thought out opinion) and belittle the game and by association the dev (including the creative choices being made).Because he has a ego so big that rather have his reputation damaged whit this ending that be a dev that listen to his fanbase and retcon this ending that the 90,%of the players didnt like it .
Just because the ending is not satisfying for you or the bigger portion of the player there is no reason to simply slander.
Did seacth justify the ending because he felt he was misunderstood or because he did not expect this kind of reaction?
We don't know.
Did seacth update the ending to appease the fanbase? (I did not play the update yet!)
Possibly.
If multiple games from the same dev receive a "bad" review, naturally either the narrative development will improve in order to find resonance with the fanbase or the dev will sink (financally) as he loses his subscriber base.
What the key take away is: The dev reacted by giving his two cents about his choice of ending. Furthermore an update dropped extending the game.
This is something, that is NOT given for many devs in either the "official" market, e.g. ubisoft, or the NSFW market.
Best course of action is just to give a well-put feedback (be it negative or positive) and put this issue to rest.