When I was teenager and even into young adulthood, I would audition / voice act for a LOT of parody content that was dubious, immature and not great - but unfortunately wasn't uncommon between 2010 - 2016.
This particular video is making fun of a really horrible fanfic and, while it doesn't glorify it, is certainly in bad taste and doesn't do a good job of clarifying that it's against the material it's parodying.
I wouldn't work on something like this today, nor would anyone else involved.