It has nothing to do with their appearances, it has to do with their characters and their actions. The saying “show, don’t tell,” exists for a reason.
Nowhere does it suggest this. That’s all just speculation, like you said. The only one she really seemed to bond with was Yon-Rogg, and they blatantly said Minn-Erva avoided her. She didn’t even know if a Skrull had posed as Korath before, which seems like it would be a common topic.p in the middle of a war. Besides, Earth is her family, not these guys.
Yon-Rogg and Talos describe them as such, and the propaganda poster with a Skrull in the beginning speaks a thousand words.
I did… 