So they meet, however briefly, in the cafeteria and on walks, but are not allowed to entertain? Bit of a logic gap there.
Might be the home's peculiar interpretation of norovirus precaution regulations. That can happen, especially with new regs imposed during a crisis. Or, as Sharnita said, it might be all about profit and budget.
Shutdowns are usually temporary. Do you know how long the home intends to enforce these policies? When asked, do they give vague answers?
If possible, it would be good (and not at all rude) to talk to governing authorities and advocates, if only to get clarification.