The article - based on a nameless source of course - claims Glick is going back to Man City. If that is true, I don't see how this is anything but neutral to negative.
Neutral - he's doing it for family/personal reasons.
Negative - Either CFG likes him and wants him with the big club, meaning we get the second rate help. Or, he decided, despite presumed assurances to the contrary before he came to NYC, that the way to advance within the organization is to be in England, because NYCFC is an afterthought. Or he hasn't gotten the support he was promised and expected.
Apart from what's in the article, it is hard to imagine he is taking the fall here. The side of the club he was responsible for was a success. Maybe behind the scenes things are bad (eg no stadium prospects at all - goodness I hope not) but this team excelled at putting people in the seats at home and away.We don't have figures, but we all seem to think they sold a lot of gear. It has been on the field - which is not his responsibility - that there has been failure. Firing him for that would be ridiculous.
Which makes me think this is his decision. And it's bad if the team cannot hold onto good people. It's never good to be a place where people do not want to work.