Yes, the PM was one of the 4 interviewers who interviewed me. HR lady, PM, tech lead (of the company), and tech lead of the product.
I can't say I'm being completely objective as I am part of this situation, but he definitely did not come across with these expectations during the interview. You could say things were pretty "rosy" in the interview (well, if something seemed wrong I probably wouldn't take the offer anyways).
Thing is, this company doesn't really have a chain of command in the sense that management/executive level people don't really talk to or bother with the going-ons of the team (I guess it feels quite "big corp" in that sense). My understanding is that in our product team of 5 (1 copywriter, 1 PM, 2 devs, 1 designer/UX), the PM is pretty much management/HR.
I just remembered something else when you mentioned the PM is probably a new hire too. For whatever reason, when I got on this team, I found out that there were 2 previous devs (different timeline, they didn't work together), before me. Basically Dev-A stayed for ~5 months or so, then Dev-B came on and left after ~3 months, then Dev-C (current tech lead for our product) came. From my understanding, they all had a 1 month-ish overlap where they had 2 devs for knowledge transfer, but it's been the first time this team has had 2 devs officially. I felt a bit iffy hearing about that (it came up in some documents I read when I started, but any questions about their involvement were always avoided)...