I didn't point flash out as a culprit, my next-to-last paragraph states that any design/technology/UI. Flash is included in this, as are pure-design sites, sites which rely heavily on JavaScript or Java, Shockwave sites, etc.

The fact that their message and their focus isn't geared towards everyone is besides the point. Much like colour is colour, usability is usability.

Sorry for being harsh, this is just my opinion and isn't meant as a slam in any way