Yeah, take that with a grain of salt. He is still throwing that hard.
Ventura hit 97 MPH for the Royals last night, multiple times, and was hitting 99 often in 2016. He isn’t, however, throwing all that hard compared to his normal velocity standards.
Take a look at what has progressed since he began throwing fire full-time in 2014.

Fast forward to last night, and that number sat at just 97 MPH.