A lot has changed since the Original Series. At present, the Federation is at War with the Klingon Empire, and Memory Alpha is a Federation Outpost. They're hardly going to open it up to their Arch Enemy are they?
You (KDF) are not missing anything by not going there. It is not a very interesting place.
Where it should be a place to just read up and learn about all things lore STO and Trek in the game (and even all sorts of mini tutorials) it is just a very boring place with a clickable console in the middle to access a data sample based gear vendor.