Some 'administrator' removed the LLBLGen Pro article in september I see, with the note that there wasn't a notable point of having the article..
I looked into getting it back, but the process is severily complicated. As we didn't write the article on wikipedia, we didn't get any notice that it was removed, so we couldn't step in. We'll see if we can add it back, but it might be it was removed because wikipedia isn't about advertising products, something which I agree with. It's odd that the article about the old open source generator is still up though.