What the poster you're replying to means is, "You know what Apple allows you to know, but you don't have the source, so you can't verify that Apple isn't lying to you."
The article seems to definitively answer that you can. But yes — if the theory is that Apple is pretending to log malware detection and remediation, one would have to disassemble the relevant parts of the OS to prove that.
If you are so inclined, which the article author is not but many others are, you can look at the binaries and reverse them to verify things yourself.