Just recently a creator I watch talked about how YouTubers sometimes create drama between each other to gain more relevance. Then they go for drinks together. Is this the case here? No way to realistically know for sure.
Probably not from Gamers Nexus' side of things. Their video is very professional, and focuses on the damage done to other companies featured on the channel, and challenges LTT and LMG to be more professional. They also said in their followup that they won't be making any more videos on the topic, their goal was to raise awareness, and now it's LTT's responsibility to decide what to change, if anything. Is LTT playing it up as drama? Maybe, but I think it's more likely that they want it treated as drama rather than legitimate criticism so that they can ignore it and move on, rather than to increase attention/ relevance.
I don't think Gamers Nexus would do something like that, they have a good history of calling out companies for bullshit they try and pull. doing that would damage their reputation.
Calling out the integrity of a channel after that channels spent millions trying to shed the perception of them as just an entertainment channel as opposed to a trustworthy and reliable review channel by investing in the lab? Who comes off here thinking LTT is even more trustworthy when it comes to their reviews which weren't trusted in the community to begin with.
If this were just some personality driven non tech recommending channel I could agree, but LTT is a channel reviewing hardware like Intel and amd to name a few alongside their wacky lets build a teleporting PC. There's just some channels where hits to reputation would hurt them as opposed to help.