I think it’s the other way around. It’s HCL links pointing to the forum. However, I was able to find none:
user@host:~/qubes-hcl$ grep -r "forum.qubes-os.org" | wc -l
104
user@host:~/qubes-hcl$ grep -r "qubes-os.discourse.group" | wc -l
0
@fsflover can you give a specific example?