There's been plenty of it. Plenty of shorthand "well the manager agrees with me cos he keeps picking him and he's Klopp so nerrr" type posts.
Moreno (seemingly) ready to be dropped 1 game in to the season, for a right footed CM, sort of runs contrary to him being fine with how things are. Also hardly endorses the theory that he's happy that Moreno is carrying out his instructions.
No, there are two clearly separate points to criticism of Moreno, which you conflated to argue that everyone supporting him is happy with both.
Is he fulfilling tactical instructions? Is he consistent enough in not making stupid mistakes?
The answer to the second is clearly not (though he did have a spell in the latter half of last season, until a couple in the final games, where he improved on that).
The answer to the former only Klopp really knows, but the lack of urgency (at least) in signing an actual starting-level left back suggests he's not regularly disobeying them. Therefore a number of people do believe that actually Moreno (tactically) is doing pretty much what Klopp asks him to do.
So for example, the penalty was a clear example of a stupid mistake, and no player is going to keep a regular place if they keep making stupid mistakes.
The first goal on the other hand is either another stupid (positional) mistake, or fulfilling Klopp's instructions (maybe, or maybe not, a fraction too early) - the only real point of disagreement on the player. No one believes continued stupid mistakes are sustainable; the disagreement is on whether bombing forward so early is his mistake or not (and by extension then, whether it's a Klopp mistake or just an acceptable risk that sometimes it'll backfire).