I suspect he is referring to the fact that whilst many people have demoed game play of various types in Leadwerks no one has yet finished and published a full game. It certainly doesn't fill me with dread nor do I think it's a bad reflection on Leadwerks or its community; but more a fact that this is still a relatively new engine and has tended to attract a higher percentage of artists than programmers maybe due to the way it excels on the graphics front. It takes some programming capability to develop AI, good game flow logic, advanced animation control and path finding solutions which are the main factors holding back most peoples realisation of any thing but the simplest of games. You need good programming capability as part of your team to compliment the artists which is of course true of any engine.
Imho, Leadwerks 2 is a very capable game engine API, certainly the nicest I have ever used, and I wouldn't let the current lack of a published game deter you in any way. It also has a very open and honest community, hence we can openly discuss issues such as this!