Oh, so that's what my other half meant when he told me about that pop-up and that it was tough to tell if it was really charging. Thanks, now I know what he meant. Good grief, what stupid placement for the message!
(Fortunately, maybe because I've gone there later at night - or because I have software 8, not 9 - I never get that pop-up at the same exact same Supercharger. He joked that he wished he had the older software, so he could charge to 90% there.)