Haleivi – I couldn’t find any historical references to this vikuach you linked to, nor to the protagonists. The Sefer in which it appears was not published until the 1960’s. So what we have, in historical terms, is an unverified secondary source which is hardly reliable.
To all those saying that they find the line “the Maharal could have made a Golem but probably didn’t” to be a bit of a cop-out, this is exactly the shitto of R’ Avrohom Gurwitz shlit’a. I heard this from a friend who learned with him b’chavrusa. My own feelings on the whole Prague Golem issue are entirely ambivalent, though Golems in general appear to be historically well documented, not least those in the Gemoro (as others have pointed out).