I don't know what version of MacOS you're on, but the commands in this article, even de-styled to take them out of ALL-CAPS, do not work on macOS Catalina.

`ls ~/Library/Preferences/com.apple.lx` does not reveal com.apple.launchservices-anything.

`ls ~/Library/Preferences/xquaranx` does not reveal any file with quarantine in the name.

That my computer logs when it quarantines something, I don't doubt, but this article is very much out of date.

P.S. I couldn't figure out how to consistently include asterisks above, so I substituted 'x'