^ Nope, that does not support the sweeping generalization made. Not at all. It is loosely related to some bumblefsck not knowing how to work on a tractor, then lawyers got involved lol.
It does not run afoul of DMCA to do a repair. Quite the opposite, every day we repair cars that don't require any activity that violates DMCA. That is not "pushing back" against right to fix/repair laws. There have been computer controlled engines in vehicles for over 30 years and most OEMs never did release firmware or facilitate hacking it. It's just this new breed of hands-off mechanic that thinks a mechanical problem can be fixed by dorking around with lines of code, instead of learning how the equipment works.
"Pushing back" means very little. We could similarly argue the rich are "pushing back" to make minimum wage 20 cents/hour, but that doesn't mean it's going to happen. That does not change right to fix/repair laws. Those laws never required manufacturers to provide the level of access that joe bumblefsck wants and enforcement of them does not prevent repair.
There is nothing new here except their lawyers defending their rights against owners who don't know WTF they're doing, or are lying with hidden agendas trying to steal that IP or hack their tractor to do silly things like drag race lol.