Neither the Invincibles nor Chelsea post 2006 are as good as City right now. Arsenal got 90 points once and they won the league that season, Chelsea did twice and won both seasons. Besides those seasons they didn't cross the 90 while City have done it what 4 times?
I don't think there was ever an occasion where a team won 90 points and lost the league, what were seeing right now in terms of the dominance Liverpool and City have had over the league in the last 4 years is unprecedented. City right now are, regrettably, arguably the greatest PL ever so losing out to them by a single point twice is nothing to be ashamed about.