They released a beta BIOS to try to fix the issues, so I don't understand saying that they weren't trying to fix them. Also, I don't think that we should assume that they were going to hide behind the warranty. They've been putting that disclaimer on beta BIOSes for at least the last year, and you'd think that a stink would've been raised by now if they weren't honoring warranties because of it. All that it takes is for one person whose warranty was denied because he flashed a beta BIOS to take to Reddit and then have that story picked up by media outlets like GN. It stands to reason that no one cared about the disclaimer before and that ASUS was honoring warranties in spite of it, but GN suddenly made a big deal of it, anyways, not realizing that it wasn't a new development.
I agree that their beta BIOSes shouldn't have that disclaimer, but it's been automatically added by their system whenever they upload a beta BIOS for over a year. The fact that this new beta BIOS got flagged with it in spite of ASUS pulling the older revisions seems more like an oversight than ASUS being "slimy."