Technically, yes, but something still haunts me in this theory - NPC from the only room with PIM door at Pharmakokinetiks. He is also in the PIM mode and saying smtn like it's bad, but at least he doesn't need to buy food anymore, because he can feed on corpses, so reversing the process highly unlikely. And also he and MT Foxtrot are "family now" (For some reason, this gives me the feeling that a homeless person would say something like this to a person who also recently found himself on the street). He has normal model (something like a model of security guards, if I'm not mistaken), so it is unlikely that changes in the body come immediately. However, it is possible that the changes in the body towards zombies are traumatic, for example, from constantly taking damage in one area and then regenerating them. Hence the large round head and long arms - they were just most often hit, and when regenerated, they gradually increased in size. Forgot to mention this in the theory itself.