It's important because guest judges are supposed to be individuals who have shown respect, dignity, and have at least tried to help communities in various ways. Lohanthony has done none of that and his youtube videos showcase him being judgemental.
He is unqualified and should not be on the show. He also has no relevant knowledge to the "drag community" and thus shouldn't even be considered to appear on RuPaul's Drag Race.
Being a guest judge is supposed to do one of 2 things;
1. Inspire viewers and the Queens themselves.
2. Entertain through their credible entertainment resume.
Lohanthony does none of that and isn't credible in the least sense of the word. He isn't even old enough to attend the nightclubs in which most drag queens perform in, so how does he knows what makes a good drag queen or what doesn't? He's also quite judgemental in his youtube videos calling others "ratchets", and often times just being rude. That is not what a guest judge is supposed to be at all.
If you're going to want to have youtubers as guest judges, I would hope you choose someone with more credibility, respect, and knowledge of the competition.