Well nowhere in the page does the author mention any attempt to be authentic or using html written the same way ad in the 90's so I am wondering where does that negativity come and why?
It looks to me this service is proposing hosting like it is the 90's, not building a web page exactly like it is the 90's with just a wee bit of retro clues.
The same way a Mazda Miata gave you the feeling of driving a british roadster of the 60's while having much more modern internals,comfort, reliability and fuel economy.
Interesting final point you bring up because all of those shortcomings are part of the experience, without them you’re experiencing something completely different. (As a classic car owner that’s not entirely a bad thing in the case of the MX-5).