Just the thinking that a Mustang floater suit is in any way, shape or form the same as a full anti-immersion suit is ridiculous beyond belief.
If it does not have booties, cuffs around wrists and a neck seal, it is a floater suit. Even the poor SARtech that perished in the Fox Basin, had an immersion suit and HE survived for 8 hours before he succumbed...
I unfortunately fly over water lots in the arctic, without immersion suits available, but I refuse to wear a mustang suit...
But yes, low flying over glassy surfaces did no one a favor that day.
W.