Thanks everyone, for the feedback.
The profiles I’m interested in are for distant cousins who have been deceased for many decades. I was under the impression that profiles for deceased individuals are usually open, but these ones are at privacy level yellow: Private with Public Biography and Family Tree. They were created several years ago, so perhaps the rules were different then.
Either way, I have created duplicate profiles for them (as suggested on the Unresponsive Profile Manager page). I would much rather not have duplicate profiles, which is why I am trying to follow the Unresponsive PM guidelines. The PMs of these profiles have been inactive for several years, according to their contributions, so I would be happy to adopt these profiles if the PMs are no longer interested in them.