Found this from 2019 from a Delta posting. At least they were thinking about it back then:
Announcing a change to our minimum pilot requirements!
Effective immediately, Delta will allow pilots of aircraft in the Powered Lift category (e.g. the V22 Osprey, AV8B Harrier, and F35B) to count 90% of your Powered Lift flight time toward our requirement of 1,000 hours fixed wing turbine time.