If you want to encourage equality, demand that every vendor has a policy on it and takes steps to avoid discrimination. If many companies do that it will spread quickly.
Doing "positive discrimination" is not making things better in the long-term. It emphasises differences that should not be a factor and causes more polarisation instead of less.
Because if you're not very publicly and loudly checking off all the DEI boxes, you're just hiring a bunch of white cisgender heterosexual men. This isn't just defcon, this is how every company acts these days.
Does not make it less racist.
The goal is for those policies to make themselves obsolete (at least where I live there is always a clear cutoff point where they should stop)
No prospective client wants to invite a public flame war over a contract dispute. Nobody wants to be constantly vigilant pending some publicity stunt. A froggy company that does this kind of stuff is probably going to be too risky for a lot of clients.
It seems far less toxic to me than most DEI based decisions.
Aside from skipping out on the bill, the biggest problem I have here is the incompetence (the same problem I normally have with DEI based decision making).
These people are running an annual conference, and not only did they poison their own well (good luck finding competent hardware vendors in the future) but they derailed one of the most interesting scheduled talks at the last minute.
People will remember this, and it has the potential to significantly impact next year's convention.