Is it?

Cursor's security announcement was posted on Oct 29 and says that the malicious extension was live "between about 2:27am PT and 1:35pm PT today"

This article says the attack took place "on Thursday" (which means Oct 29) and began at 4pm ET (which is 1pm PT)

and Binance has been tweeting that the cause of the hack may be a compromised employee laptop. yikes

The article also claims they had 36h to prep the attack, I assume this was the 36h prior to Thursday- if so unlikely to be related.