Who's to say his agent knows anything about what Kyler Murray chooses to do on social media? Why would he comment on that?
Kyler has a history of posting things that are open for interpretation, not explained. For instance, he tweeted a short clip of Thanos during the season that people speculated about a bunch. But only Kyler knows what it means to him.
I shouldn’t be obsessing over this tweet, but I can’t help it.
www.sbnation.com
So it's not out of the ordinary for him to send a message that's intended for himself. And if Kyler wiped his past from social media, who's to say he's even checked in to see the reactions? Dude could be internet free and working on improving right now for all you know.