Agreed. If I'm his agent, or any player's agent for that matter, I would strongly suggest staying off of it during the season and during the leading weeks up to the start and following the season. It may be a lot to ask in today's day and age, but I'm 26 and make damn sure I don't post anything anywhere that would ever come back to bite me. If you take a look at his post, someone not knowing he's referring to the concussion may take his comment as a threat and BOOM lawsuit.
And FWIW living here in Patsie land, you NEVER hear things like this come out. I think the last time it happened was Spikes I believe with a sex tape. They stress player privacy here in New England. My buddy worked for their marketing team and got inside scoops, he told me they would have a hot blonde secretary of Kraft's (shocking lol) come in to see the players first about social media then all the staff, including marketing and other departments associated with the team. Not saying our Rams don't do this too, but it's clear some franchises stress it more than others.