I am not quite sure why other stores do not have this in stock yet, I guess we are first in the UK to stock this (and we beat most other cube stores outside the UK)
"X" in pinyin is pronounced something like a mix of "s" and "sh" in common English words and "zh" in pinyin is pronounced like "j" (or a soft "g").
"Xiezhuan" and "jinzita" are just (the pinyin transcriptions of) the Chinese names for skewb and pyraminx, respectively; the literal meanings are "slanted/skewed turner" and "pyramid" (or even more literally, "structure shaped like the 金 character").
Also, your audio is still broken: left is way louder than right and this is super noticeable when watching with earphones. Surely this can't be too hard to fix???