Lance Lynn’s spin rate on his 4 seamer by year:
2015: 2,418
2017: 2,375 (98.2%)
2018: 2,385 (98.6%)
2019: 2,482 (102.6%)
2020: 2,492 (103.1%)
2021: 2,425 (100.2%)
Spin rate dropped slightly alongside his velocity while returning from TJS and then increased slightly alongside a velocity increase once healthy. I believe he also lost some weight and made some mechanical adjustments after joining the Yankees. Not sure I see enough there to claim a “gotcha” like Balta is trying to do, especially when the reason for massive improvement is primarily driven by arsenal changes / addition of a cutter.