Reading comprehension failure.
Statement: I did not know that natural competitors used diuretics, that is surprising to me if true.
REPLY: I don't think it is
That would mean he does not think it is TRUE. That would mean he does not think naturals use diuretics.
Coming at me like I did something wrong for showing this to you makes no sense.
Back to the topic, yes electrolyte imbalances can cause heart failure. Other things like taking too much potassium at one time can do it also.