No reason has been given or details offered on the shooting other than that the police are calling it a protest against Trump. That's not TDS, that's a mental issue that should be seriously and definitively dealt with.
But there's another reason why it can't be attributed to TDS - and that's that there's no such thing.
The origin of TDS is traced back to the late Charles Krauthammer, who invented the term "Bush Derangement Syndrome." Krauthammer was an attorney, not a psychologist or mental health professional of any kind. He was coining a pattern of behavior among opponents to Bush, probably tongue in cheek.
Of course, Trump appropriated the phrase for himself because, well, Trump. It's a non-existent urban term that means nothing.