I believe you are mischaracterizing that discussion.
A pregnant female asked for potential ways to defend herself against 3 able-bodied males while pumping gas. She had already used verbal commands, including shouting "GO AWAY!"
"...My main concern is being trapped between my vehicle and a gas pump..."(Emphasis added)
"...I’ve thought about what I would have done if the bad guy would have encroached upon me..."
Given the parameters that she laid out (i.e. continued encroachment after her clear commands to stop) it was suggested to her that the gas pump itself could be used as a weapon.
No one suggested she should have blinded men just for talking to her.
I can understand a consideration of how certain weapons will be viewed in the eyes of a jury...
But I can't imagine what jury in the world would convict a pregnant woman of splashing gasoline on a guy who was advancing on her after she yelled "GO AWAY!"
To use this as evidence of anything outside of the specific context in which it was discussed seems to be cherry picking.
I'm not sure how you phrased it to Ayoob, but I must imagine there was something lost in translation. As SN notes, this is not a new concept in the LE world. As for explaining such to a prosecutor or anyone else? I'm not sure how it would come up in conversation, but you could always point him or her to this PoliceOne article: Use of force: Downfalls of the continuum model
As the author notes, departments have been headed in this direction for over a decade now.