Nothing new...
As the first section, on photographs, etc, shows, there's no need for any perpetual licence.
You might, for a news server, want something a bit different: an item posted will end up on servers around the planet, with no control over who deletes it when.
But for a web page?
As it is, it looks like somebody has taken the ancient rights-grab boiler-plate, and then a proper lawyer has, for whatever reason, written an exception.
It might be interesting, in an academic sense, to trace just where this bit of garbage started out. It's probably legal ass-covering from the early days of the commercial internet. And for it to survive, it's probably never been challenged in court. It's never been tested.
And maybe, just maybe, this particular instance is a sign that it might soon die. Why shouldn't the the clause on photographs, etc., clear and unthreatening, become the default?