I don't think this is the same event as mentioned in that post (and in fact, the post has since been updated) as pointed out by ambiate [1] (below). The
original discussion was related to a compromise supposedly detected by RiskIQ. This is something else entirely. To quote the link in that article:
"Update via Twitter: We have detected a new compromise of jquery.com and are taking action to mitigate the attack. Updates to follow. – September 24, 2014 at 12:20PM EDT"
[1] https://news.ycombinator.com/item?id=8362743