That's really interesting. That very same link loads for me on my Windows PC, but fails to load on my Android Phone (both are using Chrome).
Here's a screenshot on my PC: (I used guest mode to ensure the browser was more "default")
I still leaning toward thinking the issue is SSL related. Here's the warning that Chrome gives me when I try to load up the PPC's homepage:
If you drill a bit deeper, you see that their SSL certificate expired on Tuesday, September 23, 2025 at 12:23:57 AM.
For people who aren't steeped in web technologies, websites use a technology similar to some technologies used in cryptocurrencies to ensure that when you request information from a website, the information is sent to you without anyone snooping on it or altering it. This technology requires special numbers called SSL certificates. SSL certificates expire, and it looks like the Pain Psychology Center hasn't updated theirs recently. Honestly, this is pretty harmless, and I'm sure that they'll get to it soon. In the meantime, since they still clearly have the same document on their site, I can try to temporarily link to an archived version of it so people can still access the file. It may take a little while to set up, though.