A new member posted in a topic in the BBC Football subforum at https://www.bigsoccer.com/forums/bbc-football.1002/ which is part of the "RESERVED" forum. How do you access that section? https://www.bigsoccer.com/categories/reserved.928/ displays the top and bottom of the page with no topics. The BBC Football subforum had four topics created this year and before that didn't have anything since the BigSoccer Bot in 2007.
It seems to be spam central if you hit a few forums higher. They're all obsolete forums, such as when Yahoo was a MLS sponsor. I'm guessing that when the admins "kill" a certain forum after a World Cup or another event, they can't truly delete it because they don't want to create database chaos, so they move it to the deepest bowls of the site. Years ago, I stumbled upon a ton of hidden forums and created a list, which I've long-since lost. One of them was something about NJ youth soccer, IIRC. (And yes, about five original BSSC members should still have personal forums somewhere on here...)