1) No
and
2) No
Sorry, it's all down to Alex.
The site uses phpBB which, as the name implies, is built using PHP.
The issue with completely rewriting it in something else would be the delay/complexities involved, replicating the look-n-feel (as near as is practical), extensive testing, and ensuring the existing data set remains compatible - it's currently held over several MySQL tables.
I suspect that simply using the current release of phpBB and investigating/implementing some phpBB add-ons would resolve many problems and improve functionality, while still leaving additional custom PHP development or improvement opportunities possible - but it took ten years to arrive at the current (outdated) update, despite the many horrible bugs in the original version.
_________________
Giraffe: a ruminant with a view.