Re-reading the article, it appears he was not attempting to "jam" the repeater - he couldn't. This had gone on for some time and without others able to hear the (his) weaker signal - because of FM's "capture" effect of signal - many would not hear it - only the repeater which propagated thru the terrain having the advantage of height and power and as if needed - PL tone.
Once they figured out how this was all going on, a Deputy was dispatched to witness how this was all arranged and played out.
This appears to be a specific target harassment issue of where he parked close to the target persons receiver - not the repeater - for a specific reason. This was a planned event - or attack - we can only speculate from the facts presently available. We have to wait for the trial and if they will release the transcripts to the public - which may never happen if minors are involved (estrangement issues)
This is where it goes wrong for him, because it shows intent to harm - single out one specific person and only to be within range to quench, or overwhelm that persons receiver. One can only imagine the "one sided" conversation the person is dealing with in having to listen to it.
So he knew what he was doing, and in regards to general mayhem he would cause - the above being a one-on-one event shows that he simply has issues with how the world has left him behind.
A lot like Hannibal Lector "Inviting a friend for dinner"
From the website...
...The purpose of this site is not to inspire violence or hatred of the members of the Gator Amateur Radio Society or The Southwest Louisiana Amateur Repeater Club, or whatever the hell they want to call themselves...
It's what is left, said after the "Whatever" in the above phrase, that is disturbing. It's self-immolating the whole purpose of the website.