Thanks for the screenshots but I believe that warning is regarding the potential for hydro lock if you pour too much in too fast.Please Read the warning posted on their site for reference :teacher:
I see no warning ANYWHERE that this chemical is corrosive to rubber parts.
In fact Jim at Sea Foam told me just the opposite, "Sea Foam is petroleum based and will not affect rubber components and even through you used the other port all Sea Foam got sucked into the motor."
So why do I now have a hole in the booster diaphram?
MAYBE it's a total coincidence - but still very suspect.