These JL fares pop up every so often -- I flew JFK-TPE in January 2020 on a similar fare, and I'm really glad they are back.
You can get it down to about $1900 with Amex IAP.
It looks like it books into I class. I believe JL is in the process of swapping X and I to align fare classes with their partners, but it seems AA and AS have not caught on yet. BA has though.
So when crediting to AS on an I fare it's 70% miles? Yikes