Maybe I'm mistaken but I don't think the above is necessarily true. EAU is run from a different fare bucket than regular buyable F. I'm sure they hold some F seats back hoping to sell them. I'm guessing that certain routes have a higher percentage of F seats sold between 5 and O days prior to flight that would end up not being sold because they'd have been filled by Plats.

Although I'd love it to be true, I don't think it would be smart to give up all available F seats at 5 days prior to flight.

I could be wrong about this, maybe someone else can confirm or correct.