Links to specific examples are less of a problem as he could redirect those to compiler-explorer.com and just keep that redirect up forever. Really the only URL that would need to be "reclaimed" is https://godbolt.org/ and having a prominent link to compiler-explorer.com thee would solve that issue.

OTOH the godbolt domain is at least not actively used for a number of other TLDs getting one of those might be an easier option.