Well, thankfully, K-Meleon users can easily change their useragent to anything they want, mimicking what they support, with Firefox 2 being one of the default options, and anything else being possible through the custom option.
I can't help but wonder how old that page originally is, considering they mention
WebTVw which technically hasn't been called that since July 2001 (does Microsoft still offer service for it?). They may just have slapped a date on it recently and not bothered to change the list of browsers and their versions.