there are some pretty hilarious markings in it though, i especially like 'quasi confuso', like you could play it any other way 
Yes, there are - but then that piece is not the only example where M-AH inserts performance and other directions in a piece which may not itself be intended as a joke. Indeed, the "confuse is lifted from the "sempre più confuso" in, I think, Ferneyhough's piano work Lemma-Icon-Epigram - hardly a joke piece itself. Perhaps, in the case of this Prélude, le marteau pneumatique est sans maître...
Best,
Alistair