Thank you for that. It appears that he has already been notified about this thread.
For those of you who want to read that post, but don't know German, I can translate it roughly:
He says that he's now got hold of copies of the instructions, that it's interesting to see his own models like that, and that the instructions seem to be well-made. Miran Pris, as the copycat is called, has obviously studied pictures of the models very carefully. But details that are not visible in the pictures, not least the staircases, have been recreated in very strange ways - and he says he's not sure that the corner tower on the café will be buildable at all the way it's designed in the instructions.
He also says - like I have stated before - that he can't just publish these instructions and make them available for everyone (it's a matter of copyright - even though the original creation belongs to stefauster, Miran Pris legally owns the copyrights on his instructions, strange as it may seem) but that he's currently making his own instructions for his buildings. Which seems like a very good counter-measure.
Lastly, he says, "Please don't buy any more instructions from Miran Pris."
I don't know how much money would suffice, but in the 1000steine thread somebody's done a quick count of how much money Miran Pris probably has made so far - he's sold 1057 building instructions at 6 Euros a piece. That's 6342 Euros, made from other people's designs. Or a bit more than 8000 US dollars. Not exactly small change, is it?