I think you are correct that GP is evading your reference, and further I think they are over the line of trolling, but I do think you are mistaken in your reading (or at least, you are reading more into the document than it reads itself). For example:
> shall coordinate the termination of all discriminatory programs, including illegal DEI and “diversity, equity, inclusion, and accessibility” (DEIA) mandates, policies, programs, preferences, and activities in the Federal Government, under whatever name they appear.
Their premise seems to be that programs (including performance reviews mentioned later in the document) which provide preferential or beneficial treatment to people based on DEIA characteristics are discriminatory and illegal under current laws, which prohibit discrimination on protected classes. I.e. you can't promote someone for being a man, or for being a woman, because sex is a protected class. If you create a program to help train/network people of a specific sex to the exclusion of the other sex, that violates the law (according to the argument being put forth here. IANAL so am not providing legal analysis, just doing my best to steel man their side here). The order you linked seems to be trying to stop this "illegal" practice in the US federal government. Note that the ADA is not illegal, in fact it is the law. Nothing in there is repealing the ADA or paring it back, at least that I read. I wouldn't be shocked if they are doing so through a different channel, but at a minimum the source you posted does not seem to validate your claims.
The claim I was refuting was that the government does not consider Accessibility under DEIA. That's it. And in the plain text of the executive order, they include it.
And please, reread the executive order. I can't believe I need to explain to two separate people what is said in the plainest, clearest language possible:
> (a) The Director of the Office of Management and Budget (OMB), assisted by the Attorney General and the Director of the Office of Personnel Management (OPM), shall coordinate the termination of all discriminatory programs, including illegal DEI and “diversity, equity, inclusion, and accessibility” (DEIA) mandates, policies, programs, preferences, and activities in the Federal Government, under whatever name they appear
It says the termination of ALL discriminatory programs, including but not limited to 'illegal DEIA'. This is clear that they, by definition, consider DEIA as a whole discriminatory. And it takes all of five seconds to check how the admin has been behaving over the past few months to see that this is what they are doing.