Not everyone who comes up in the suggested has been looking at your profile. Often there is something in common, like location or a page / group you have both interacted with. Someone who has died is always been suggested to me, although we have mutual friends.I 100% get what you mean. I am undiagnosed but suspected (hello 90s eldest daughter high achiever so couldn't possibly be autistic).
This has been a real struggle of mine for years, so I know how you feel