Not really. The “file types” you’re talking about are expected to contain whatever things in a very specific format.
You’re really just saying “many file types use an efficient and common compression algorithm”. Which is correct, obvious, and to be expected.
What happens if I put an mp3 or an epub file in there with the xml? Is it still a word document?
Maybe, I was just giving an example. Like Java jar files are just zip files with other jars in them.