will always get you to it, it's special.
I just checked an it is open. My guess would be that you're looking at the older link to that topic. When topics get a lot of posts (as RTT has consistently for years), the older posts get split-off and left in a closed topic.
Usually, if you just check the Vintage_Games forum https://gametz.com/forum/Vintage_Games
the latest/open incarnation of that topic will be at or near the top. And, if you follow it consistently, it should transition you smoothly to the new topic when it splits off. But, depending on how people use the site, you may have saved an old link or something, I don't know. It is semi-bad that the topic's link keeps changing as the new topic is made. But, that's partly why https://gametz.com/RTT.html