The "entirety" of 8chan is not deleted. The data still exist. For a couple days maybe it was not accessible to the public via network, and it is now not accessible to the pubic via its domainname. The website is available now (not via domainname) and is read-only, so no new shared research and remarks are available there since Sunday.
Press descriptions of 8chan are as accurate as the claim that "Trump is a racist."
The current owner of the website is happy to testify to Congress and the public. Conmgress is hostile to free speech, having enabled Twitter and Facebook to ban conservative speech with statutory immunity from suit.
They are having a much harder time getting back on line than I thought that they would. If then end up only being available on the dark web via Tor then, for all intents and purposes they are effectively dead.
Gab was able to resurrect their site, but it took months. When the eventually re-emerged the old content was there, but they had a new URL (Gab.com, replacing Gab.ai I think).
As others have mentioned 8chan is the home of Q, so shutting it down is putting a crimp in Q, though I think there are many other ways that Q could easily find to post his messages that would not require him (them) getting all of 8chan up.
But with any of them there will be potential for authenticity issues. (Where as most people who understand the 8 chan "tripcode" system believe it's secure and that Q and only Q has been posting under that moniker on 8chan.
Q previously migrated from 4chan to 8chan, which was claimed to be due to security concerns.