Thanks again.
Once you have an archive, you can convert that unstructured data to structured data. For example, if I look at https://www.vbulletin.org/forum/showthread.php?t=326241, the thread title and hierarchy is in <table class="navheader">, posts are in <div id="posts">, etc. I see an old project (https://github.com/IanLondon/detectorist-scraper) that may be a useful place to start, and I imagine there have been other similar efforts.
Once you have a structured representation (in a database, in JSON/XML files, etc.), you can decide whether to use it to build a static site, to import it into other forum software, etc.
One potential option but definitely a bit more work would be, once you have all the warc files downloaded, you can open them all in python using the warctools module and maybe beautifulsoup and potentially parse/extract all of the data embedded in the WARC archives into your own "fresh" HTML webserver.
An Introduction to the WARC File