This concern applies to ALL ammo. From EVERY manufacturer. In ALL sub-compact short barrel guns.My concern would be verifying that velocity and performance out of the Hellcat barrel. Maybe some of the videos you mention use a similarly short barrel. That would be a great indicator.
Pretty much same can be said about expansion and penetration of bullets out of ALL sub-compact short barrel guns. So you need to have a lot more access to gelatin, chronographs and ammo than I have access to to test all these things.
We do know that short barrel guns and heavy bullets (3" 9mm, 147gr) tend to underperform, that has been shown time and time again. That is pretty undisputed.