The first quoted sentence is exactly the kind of ambiguous thing I fear.
The way I understand it, it means that the 3D objects that appear in the game have been made with a program that was written in Blitz Basic.
Does it mean that the game/game engine is written in Blitz Basic? I don't know.
Let's hope that some of the coders/crackers can take a look at the game files and give a definite answer.