Just gonna quote a reddit post talking about this.
I take stories like this with a lot of skepticism and I'll explain why.
I've worked as a contractor for many companies. By nature, you are an appendage hired on temporarily to take on the extra workload from the permanent employees. If a permanent position opens up while you're there, you have a leg up on outside applicants, but you're not promised a permanent place there and the full time employees will always have more sway than you. They will be responsible for the most important projects, and their work and opinions will be given more weight.
I don't consider myself a minority (some consider middle-eastern non-white, but I don't feel my life experience reflects that) so I have never attributed my experience at companies to have something to do with my identity. I take it at face value that if I'm freelancing, I'm there to help, build relationships, and hopefully gain a permanent position down the road where I can really contribute and make some real change.
I don't know this person, but my impression based on their description of the situation is that they had unrealistic expectations about their work experience and felt entitled to a lot very quickly.
From their description, it sounded like this person was very quick to point out how "problematic" Wizards' products are.
WotC didn't hire this person to be lectured. They hired them to help create products for sale. If you do good work, you move up in your career. Then you're in a position where your voice has power. You can't expect to be hired as a freelancer and have management make huge structural changes just in light of your identity. I remember reading a study about how young people are more prone to depression because they expect their work to be unrealistically meaningful and bring about change. How is that feasible in this context? You were JUST hired, as a freelancer, at a company of thousands, making a product with a 50 year old legacy. How fast do you expect things to happen for you?
If this person's priority is making change in the world, the fastest way to do that is not by working for the largest corporate producer of RPG products, it's to make and market an independent alternative. But if they want to work for WotC, the best way to do that is to conform to their culture and grow within it. Not to show up and brute force your ideology onto their team, expecting special treatment because the world is bigoted and your identity entitles you to a some kind of bullhorn.
Twitter has given them a huge platform to air their grievance now. I noticed they linked their Paypal and Venmo for support as well. I don't know, the whole thing strikes me as very one-sided and opportunistic. Wizards essentially has no way to respond to these accusations without appearing to bully a minority individual. I expect this person to be benefit hugely from this publicity and from the RPG ecosystem that Wizards has built.