Hi Cinna,
I had a similar discussion with Frank a while back, about how the forum title might be confusing to some people - as someone already mentioned, it depends on where you tack on the word "Traditional" - is it a modifier for just the word "Folders" or for the entire phrase "Folders and Fixed Blades." Turns out it's for the entire phrase. My point here being that you are not the only one to need clarification of that title since it can be interpreted two ways, so welcome to the "Oh, that's what that means" club.
There's a sticky post at the top that largely describes what they mean - but unfortunately they refer to a specific knife book, which is long out of print and hard to find, as the reference guide. If you don't own that book or know what it contains, you're sort of at a loss.
My best advice is to stick around and learn from the context of what is and isn't allowed. Gary and Frank are pretty easy going guys and will just remind people or move threads as needed. Never take that personally, they certainly don't mean it that way, they're just doing what needs doing.
There are plenty of times where there may be a question someone asks, where the best answer is "oh, you probably want to check out a <insert modern knife here> but you can't give them the answer. That's just the rules. If there weren't rules, we would just have one giant General forum and special interest discussions would get lost in the shuffle.
As was already mentioned, I can't show or discuss my Case T***lock because even though it looks like a traditional knife, it is a springless liner-lock with a thumbstud and pocket clip, which doesn't fit the standards here, even though 95% of Case's product line does.
Eventually you'll get the hang of what's allowed and what's not. It may seem arbitrary in some instances, but they have to draw the line somewhere.