It looks that developer is from Switzerland and his site is translated in a lot of languages including Chinese, Russian, Greek, etc. But the English description here is like some riddle. Can developer or MU fix the description?
Current app description:
"xZ allows you to get an app that does not only xZ and 7z, but also a lot of other format. I other words, if you get this app you most likely don't need anything else to decompress archived and compressed files."
What I understand:
xZ (may be the app name?) allows you to get (may be downloading it separately) an app (wait, we need another app?) that does xZ, 7z and other format(s) (may be zip?). The next sentence is better, but there is a missing "n" in "I other words".
"xZ app decompresses xZ, 7z and some other formats."