But there's even inconsistencies, if you just look internally to the message. The full message is here, about a quarter down. It's taken from the charging documents.

The text was shown as being sent Sept 10. It states “the feds released a photo of the rifle”

Except photos were not released until Sept 11.

Actually I took a good look at the link at newsweek.com site, and it doesn't have the date on it. But this one - https://www.bbc.com/news/articles/c99g1e0z2ero - says "Here's the full record of a series of text messages exchanged with the alleged gunman on the day of the shooting". And the day of the shooting was Sept. 10.