How so? For all we know, the 0 could represent "the zero year" or something to that accord, just as 32 represents the 32 Chambers.No, sub32 refers to 32 chambers. Sub0 is quite different.
If it was a prequel, it would be part of the main series. Since it's not, perhaps Mateusz represented "0" as in "not associated with the main storyline." Just as how FLF is simply "Submachine: Future Loop Foundation," and has no number associated with it, I'm sure the 0 may not even be necessary - It may just be "Submachine: The Ancient Adventure."