[robflaherty]

The Internet Archive rewrites contents of scripts to inject the archive URLs. A better explanation than OP's clickbait is that someone went to the archive to copy/paste misplaced tracking code.

[LordDragonfang]

Everyone assumes that is the case yes. That doesn't make the title factually incorrect, though.

[robflaherty]

Based on the replies to the tweet very few have assumed this is the case and no, “using as a CDN” and “accidentally linked to” are not the same thing.