Most people running these groups are not technical. Even if they got the word in time, the only option many of them could find was PGOnline, a Win pay software, which by this point Yahoo has blocked. Furthermore, even if they got it, what do they do with it? For many groups, the archives are a resource to be referred to. They need to be hosted somewhere, preferably with some kind of front-end search engine. Even better if the search engine integrates with any new posts on the forum they move to.

The Archive Team has been taking requests for backups of groups for people who don't have the technical facility to run the python scripts. They then intend to make them available on the internet archive. The next project is making some kind of front end, in case group owners want to host that somewhere. Some of us, for example, will be doing that behind some kind of a forum login, so it won't be search engine indexed.

As for your point 2, that was cut/pasted from the link in the OP, where it's describing that many groups are still using the platform. More relevant to this project, is that many groups are losing their archives, and those archives contain anything from scientific data, to hobbyist & howto information, to art and literature, etc.