Going by memory here but according to Neight in the video from post #4 Darren was already on tilt from losing his match to Filler when Darren was up big twice in the match including 10-7 in the race to 11, and also because Filler took a time out and went to his table to wipe his hands or take a drink or whatever it was before shooting the final set winning 9 ball which was a hanger six inches from the pocket that couldn't be missed. So he is already on tilt and then gets told he was chosen for a drug test when he was just chosen for one at the last event a week before which apparently irritated him even more. Anyway he had just peed 20 minutes earlier so was sitting there drinking water trying to make himself need to go. During this time the drug tester apparently tried to make small talk with Darren and Darren told him to "fu<k off". Shortly after a Matchroom employee was in the area and was grinning or giggling about something, Darren assumed it was about him and so he told them they needed to "wipe the smirk off your face".
After the WPA takes a few days to make a decision on what to do they sent Darren an email saying he was being fined 25% of his winnings, and his winnings were $6,000 making for an effective fine of $1,500, and that if he has any future WPA violations he will be banned from all WPA events for a period of one year. He apparently also had to write a letter of apology to several of the involved parties. It was mentioned that Darren does have one previous WPA behavior violation of some kind from around 2016-ish where he got into it with another player but no details were given.
Neight never named any sources so it could all be 4th hand hearsay for all we know, and even if he heard any of it directly from the involved parties we don't know for sure which or how many of the involved parties he heard from, and he apparently never saw or heard any of it for himself so he can't personally verify anything at this moment as far as we know.
So the obvious question to be asked is, was the punishment appropriate for the "crimes"? My thoughts are that it very well could be, or it might not be, we simply have no way of knowing ourselves without hearing from all the involved parties, hearing what they say happened, what each admits to or denies, hearing who sounded most believable, whose story made the most sense, etc.