I guess he had no copyright and also no right to use the PA new era logo so port and New Era could sue him if he's trying to claim ownership so no leg to stand on really.
Thats not how copyright works at all. It subsists as soon as you produce a 'work'.
There'd be other IP law issues here, that would likely prevent the author from pursuing action, but the general trend is towards extending protection to works communicated via social media.