Yeah–I was trying to find out what the difference to "good faith" is, and from a bit of googling, it appears to be an attempt to sell the old concept with a new name?
I somehow prefer "good faith", even though it's meaning is harder to parse when you first hear it. The 'faith' does a better job of hinting at the emotional component of the concept.
Oh come on — you are violating AGF in guessing about the "attempt to sell…". It's far more likely that this "assume positive intent" idea and post is just by people who were unaware of AGF as an existing principle. Follow AGF and just help point them and everyone here to the worked out Wikipedia concept. No need to assume bad faith of the people writing "assume positive intent"!
I somehow prefer "good faith", even though it's meaning is harder to parse when you first hear it. The 'faith' does a better job of hinting at the emotional component of the concept.