There is nothing wrong If he wakes up from a long sleep of inactivenes. And there is no point red raging him without hearing from him. Atleast he should make some post and people will have some conversation with him to confirm his true identity. If it's a hacked account I guess his approach wil eventually tell who really he is. From hense he can be tagged, and warning will be given or distributed to the community to stay clear from him simply because it's n imposter/ scammer. But if he is who we think then we can oncover a lot useful information from him.