We are both no doubt reading too much into it.
I don't read it the same way as you, not with the additional plus bit.
The way I read it, while looking at the PA drawings. The premium seats (doesn't actually say how many or where, but let's assume the 648 block) will have access to a 500 seat food hall. Which I take as being within the grey zone if you would, that other GA regular seating will also have access to. They don't say that bit is premium, just that it is there. And ALSO, a premium bar, where the previous hospitality boxes were, for 300 people. That to me can be nothing othrer than the purple GA+ bar. The 300 is the interesting number though, with a couple of possible implications. a) booth seating. Which would make it a somewhat different offering to what is already around the grounds in joes and 93.20 bars b)an actual reduction from what is shown on the PA, which presumably would mean a reduction in the GA+ seat provision as well. Or c) different levels of offerings for the GA+ i.e for x amount you get a padded seat in a prime location but have to slum it with the others in the main concourse, or for y amount you get the same seat And access to a private bar with lesser capacity. Tenuous though.
To stress again, just my own reading into it and speculation.