Like
ViperDonkey said, I don't see why L&P would use a second, weaker computer to render scenes he can easily render over night on his main rig via batch rendering, which is also basically twice as powerful if he's really using 2x3090's on the main rig, and 1x3090 on the other. It's also news to me that L&P apparently has a second computer in use for this project(?). That would maybe make sense if he were to produce hundreds of renders per day, to a point where the main rig wouldn't be able to render everything fast enough over night before L&P starts working again. I assume there are other reasons to use multiple rigs, possibly animations or something like that? But I've never spend a single minute in DAZ, PS or anything required for a project like this one, so I've honestly no clue.
Anyway, from what I understand, if a render would turn out to be bad he'd check them the next day anyway and can adjust them right then and there, or right after the next couple scenes he's planned for the day. After that, batch render everything he's worked on. Rinse and repeat. No need for a second computer, unless I'm really missing something here. It's not like he can adjust or work on multiple scenes at the same time anyway, even if he were to use 10 computers. And I also don't see how a second rig would save him any time as he just keeps working on scenes until his "workday" is over. Which is when he starts the batch rendering again. A completely automated process that's best done over night, or whenever he's not on his computer doing whatever(from what I understand).