Do reddit admins regularly communicate with a sub's mod?

I have been running a small-ish sub (currently 80k users) for a few years and have never been contacted by anyone from admin. However since early this year, I have been receiving regular (almost monthly) modmails and chat requests from someone who says they are a reddit admin. It seems legitimate to me because they have a red "ADMIN" flair in all their communications with me. Most of the communication provided tips and advice on managing a sub or ask if I need any support. I was also invited to a meetup with moderators of other subs who also live in my city. I haven't really required any help so I just filed those messages away without replying.

This week however, another user claiming to be a Growth Builder from reddit sent me a group chat request, including the reddit admin who has been messaging me for months and another user with a red ADMIN flair. They say a local influencer wishes to do an AMA on my sub. When I expressed my interest, they've provided a set of instructions which includes promoting one of them as an approved user and temporary mod so they can make the necessary posts as well as help run the AMA.

I figured before I add a random stranger as a mod, even if that stranger claims to be a reddit admin, I better confirm if this is legit. Has anyone experienced reddit reaching out to you with AMAs like this? Most importantly, how can I verify if this is legit?