Those isolated quotes are of course funny to read and to laugh at, but more often than not they're taken out of context on here. I didn't watch the interview so someone can correct me if I'm wrong, but I doubt Klopp himself started talking about a potential title challenge. You can only answer the questions which are asked as a manager up there.
In se there's not even a lot wrong with what he says - if every member of our squad would be healthy and available for the entire season, I'd wager we'd be at least a couple of points better off right now which would put us somewhere around 70-75 points and right in the middle of the title race. Thing is, as already stated before on this page, that's purely hypothetical and a straw man argument: if United finished all their chances, if City had a competent defense, ... It's just useless to make those kind of assumptions, but if he was asked about it, I don't see anything wrong with it tbf.