Yes it's completely gone. Some or perhaps all of the contributors to the old forums who have transfered to here may still have example/demo files, but you need to ask a specific question to find out.
That's an awful pity. The CommunityPlus forums were a fantastic repository of help and knowledge for the Serif Plus range of software. If none of the Serif staff could be spared to run the forums, I'm sure that some of the more experienced and knowledgeable of the forum members would've been only too happy to step up and take over as admins or moderators. At the very least, the forums could've been archived and made read-only. Nobody would've been able to post, but at least all that knowledge would've been preserved for any Plus users to read. But to just scrub them like that, to wipe them from existence, was an act of pure vandalism.
From memory, the WebPlus software could not be modified to keep pace with other emerging responsive software. It needed to be completely rewritten as a new product line. The demise of Webplus was hastened by the departure of the principal programmer/developer. Serif chose to go in a different direction and dump the Plus range.
I understand that completely. It was very sad that development on all of the Plus range ceased prematurely, before the Affinity software was ready for purpose (it's still years behind the Plus software re: functionality), but we could've taken that on the chin if they'd been more sympathetic and supportive of long-standing customers. But the way that they treated the loyal, long term Plus users who had helped make the company in the first place really sticks in the gut. Serif's attitude was disgusting. Former customers were cast adrift, cut off completely and treated like lepers or pariahs. It was as though Serif tried to erase them, pretend that they didn't exist. What a lousy way to treat the customers who had helped make your company successful. But Serif aren't making any money from them anymore, so they don't give a toss about them.
You'd think Serif would have at least left CommunityPlus up there as a support forum, to show a bit of thanks to previous customers for their loyalty. But no, they couldn't even do that. Considering the fact that the moderators on the Affinity forums always advise people who use Plus software to continue using those programs if the Affinity programs don't suit their needs, I find the fact that Serif have erased the only Plus software support forum to be highly ironic.