I've flown with inflight crew that are similar, both here and at other airlines. There's not many of them, but some really do just love everything about their job and have a huge personality.
I had one who just had a HUGE smile on his face the entire time greeting people and while working, always commenting or making little jokes while people boarded. His announcements were always very over the top friendly, or even funny. I've heard pax applaud for FAs once we pull into the gate etc. I don't think it's propaganda at all. In a time when people are being dragged off airliners, having a great experience now is just, odd.