I think the issue the legal team faces is that many of the things Trevor says are clearly false and misleading.For example, he claimed multiple times that Nikola is generating 3.5 megawatts of energy from solar panels on their roof. There is simply nothing there, it is a bold lie so naturally it's not referenced in their response at all.
The entire company is built around mysterious battery tech that's twice as efficient as Tesla's batteries and hydrogen production at 18.75% of current cost. That is the central fraud in the company just as the unrealistic notion of droplets of blood for reliable testing was at Theranos.
Eventually, if Nikola persists in trying use hydrogen they will face the technological and economic reality they've been hiding from investors and the company will fail.
It would be somewhat understandable if they'd be trying to weasel out of one or two issues.
But when all but a few of your rebuttals are "oh but in a strict technical sense, we didn't make the claims that Hingerburg is challenging", like "we never said the truck was under its own propulsion, the video was just called "in motion", or "the contract that we claimed was worth 250 million had an option that made it potentially worth 250 million", then that just underlines how much bullshit they have been spewing.