It's not only AI that uses em-dashes, but AI only seems to use em-dashes.
And there's an ellipsis ascii char in there too (not 3 periods in sequence, a single ellipsis char), somewhat of another AI tell.
Yeah, and it's alt+k on my default keyboard layout on debian… I think some punctuation is available on macos as well — so perhaps it's a windows-ism that «only AI can use punctuation».