I think we'll see something like it again. Maybe not quite 80+ IP and 50+ saves with how relievers are used now but just in the last ten years multiple guys (Edwin Diaz, Liam Hendriks, Craig Kimbrel, Devin Williams, Aroldis Chapman) have had comparable seasons in various ways.
Like 2012 Kimbrel was insane. 0.78 FIP, 0.88 xFIP
2020 Devin Williams in the short season was nuts
Diaz this year was insane.
2019 Hendriks was extremely good AND the A's let him throw 80+ innings.