Maybe, maybe not, we cannot say for sure. Even if they haven't, I think that there is nothing you can do that could really help your case. But this is only my personal opinion.

I am in a similar position: no response from any of the three reviewers. But I think that it does not have to be a bad news: maybe they do not need more details to take their decisions.

You have to remember that maybe they are not that interested by you research so they will just ask enough question to have a global view and not more.

I think this is not a good idea to message the AC.

What do you think they can do? They cannot force the reviewers to ask questions. Then they will just lose time with your request while being very busy by the multiple submissions they are managing. It would only make you look impatient or unprofessional which will not help.