>>3014478B&W movie film is mostly the same as B&W still film. Only differences are remjet (comes off in developer, dev is single shot), which is likely not in P30 given how Ferrania supposedly controls the entire production chain, and the reversal step which involves re-flashing and bleaching in potassium permanganate. (according to a Youtube video of some spaghetti-style super8 development I saw, anyway.)
There's no point to making B&W E6, and the sample pictures don't look like they're made out of dye clouds anyway. So the E6 hypothesis is, I believe, bunkus.
