Very much, but this chart, and I would say the article is pretty much complete garbage.

Yes, we collectively should save Flash content for its posterity of the older web. But that's a big thing for Archive.org to handle. And I'm sure we can construct a VM to download and use flash content. The only gotcha there, is content that streams from a remote server. The VM would likely be without any networking support, to prevent easily hacked machines (the major reason why we collectively dumped flash).

Also HTML is apparently more complex than JPEG and MP3. I'll remember that next time I"m hand-coding some audio files and using a machine to generate HTML.