The Communist Manifesto was similarly arrogant and angry, but at least somewhat understandable. :)
These manifestos weren't intended to be understandable, exactly. They were poetic and designed to communicate a revolutionary artistic energy. The original Futurist manifesto was by the poet Marinetti (who I think is primarily remembered for that) and had a big influence on Russian poetry. The Futurists liked speed and rebellion. They probably would have gone for rock and roll.
I agree with you that it's not clear what point about programming these authors were trying to make. Perhaps they were mostly just "covering" the original piece.
Let us make an end also to the wasters of disk space who clutter up our machines and profane our lightning-fast memories!
Translation: Down with Windows!
An end to the quick-money architecture of the jobbers of the prefabricated!
Translation: Down with uhh ... uhhh ???
An End to the common run of program decorators, the fakers of technology, the masters of software cosmetology who sell themselves, and the slovenly and thick headed "managers"!
Translation: Down with consultants!
This movement's so old the Catholic church made it one of the seven deadly sins, called "pride of life."