Shaw's cable modems do release their IP eventually, but they need to be off/unplugged for more like a week. I have tried it myself a few times, when leaving for the weekend it stayed the same when I restarted it, but when I hit the beach for 10 days, it was a new IP address. To be safe, anyone using that site should always use a VPN, although they do routinely block all TOR/Onion IPs.
The main issue is that the board owner is more than a little insane and addicted to drama. He routinely pits his moderators and admins against one another and if the drama isn't enough, he pulls stunts like that ones noted above. He's spoofed Fred's email more than a few times, pretending to be him, giving bogus warnings and attempting to harm TERB's reputation. You can be 100% assured that your PMs over there are not safe/secure, and you should NEVER use the same password/email combo there as you do here, and especially not the same password you use for your email account, unless you want to be hacked.