I wouldn't rule out the possibility that just pushing the ESS AC FEED P/B without having the least bit of an overview over the aircraft status or without any idea of the electrical prolem's nature might tur bad to worse. But the probability is obviously small enough, otherwise the 'note' wouldn't have found it's way in the books.
In my opinion the A320 systems' design is finally starting to uncover some dark spots, same thing with the PTU in case of an G or Y HYD low level.
There were some cases, where this happened during T/O Roll or shortly thereafter. During the time it took to climb to 1500 AGL (end of TO Inhibition) and until the crew had handled the ECAM-Procedure which would finally call for PTU.....OFF, the PTU overheated and caused the other HYD System to fail due to a RSVR OVHT condition, thus causing a G+Y HYD Failure and thereby a full-blown Emergency.
So now we have another 'note' to switch off the PTU by memory in this case, kind of ridiculing the entire ECAM handling. I see it's important, but why not create a '1st class memory action'? Unfortunately a modification is not to be expected, seems like AI is rather tending to NWS Control Boxes and the like.
What's next?
Regards MAX