Let me break down the terms:
PC = Politically correct, as in "Equitable"
SJW = Social Justice Warrior, as in "I advocate for an equitable society"
Forced = Imposing a requirement
Diversity = Concerning the diverse nature of people and their backgrounds.
Virtue signalling = Demonstrating a personal belief on a public level.
So, in conclusion, what Lorcan is saying is:
Clearly this is just equitable people who are advocating for an equitable society by imposing requirements to observe the diverse nature of people and their backgrounds by demonstrating these personal beliefs in public.