Listen, I'm no expert but I defer to them. They happen to work for powder companies or some other munitions organization in my opinion.
All this is just a sign of the times: "Blame it on someone else." Common for today.
But, on the subject of Titegroup, I have used only one pound of it and will not go back to it again, ever, for any caliber, period. If 2.7gr of Bullseye gave you an upset stomach when you loaded those 148gr 38spl wadcutters, you would probably lose your lunch if you saw how little Titegroup 2.7gr was in that case.
Didn't folks claim that that fast powder caused blowups then too? Yeah. Truth be told though, there was a "pop" that was missed and followed by a BANG. Just surmising and, I feel mine summations have as much validity as other's.
No, this was a result of loading practices rather than the phantom combustion theory.
p.s. I did use Titegroup in the 500 for a short time. It was in a Handi-Rifle though, not a handgun. Really, I wouldn't even use that powder now in 380! I guess I already said that though!
My advice to the shooter, man up.