He talks plenty about case law and cases he has litigated. He's not just giving an opinion because he's a lawyer, nor does he ever say anything about being right, instead he approaches the topic very objectively. I've been around long enough to smell uninformed opinion, this video isn't uninformed opinion. I challenge you to watch it and tell me if my take is on the mark.
Out of respect for your polite request, I watched the video. I was happy to see Mr. Steve Lehto in the video - I watch his channel often. The other guy (Paul) is a clown and I resent giving him any click.
The original article infers the infraction was changing the control software which "automatically" voids the warranty because it can be tracked. The article doesn't mention other reasons - which may or may not have existed.
Specific parts in said video that I see refuting this - note this is highly paraphrased, please watch yourself.
12:40 Paul uses this specific example that flashed firmware leaves the owner with no recourse and the dealer can specifically deny warranty.
14:00 Mr. Lehto counters this with if they flashed the ECM AND it caused the engine to produce 100 more horspeower which damaged the engine - so again, Mr. Lehto is using the result of the flash as an excuse - not the flash itself. He also indicates the next step would be litigation involving experts and a jury.
Mr. Lehto indicates (again, highly paraphrased) that the modification itself must be shown by a preponderance of evidence to a jury that it caused the defect, and even if so, its not worth fighting because the OEM's have more lawyers and money than you do - ie if you modify your vehicle expect problems because you can't fight city hall.
Some more spots:
6:50 - Mr. Lehto references that the vehicle was modified AND the modification caused the defect
7:20 Paul indicates the proof of the modification caused the problem is not the burden of the OEM, and Mr. Lehto refutes this at 8:00 saying only the preponderance of evidence needs to be proven to a jury, but all cases are decided by the preponderance of evidence.
8:42 Mr Lehto says he advises his clients to return the vehicle to stock and take it back and the dealer should fix it.
Again there is a lot we don't know about this particular case.