Ridiculous response, not to mention totally rude. The WordPress core is 8.5 MB, so it wouldn't even be noticeable on any modern PC.
Also, your so-called "reasoning" makes no sense whatsoever. Clearly, you're just arguing for the sake of being argumentative, not because you have anything valuable to contribute to the discussion. If a new version of WordPress added some new function, that function would then become available to IntelliSense, but obviously nothing is forcing you to use the function. The syntax validation would work just fine on an older version. Sure, some functions eventually become deprecated, but it takes years for a deprecated function to actually be removed from the code base,
Finally, to your assertion that "a majority of users won't be using it", it's actually the other way around. According to WikiPedia, "As of June 2019, WordPress is used by 60.8% of all the websites whose content management system is known. This is 27.5% of the top 10 million websites." But yeah, I guess you're right, no one uses WordPress, LMFAO.
I proposed an idea that would make it more convenient for DevSense to work with the most popular PHP-based content management system on the planet, by far. If you don't use WordPress yourself, then kindly mind your own business.