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I'm pretty sure that's why they're called cold sores, and I've had them happen during flus before, although not during the vast majority of them. Nevertheless, I haven't ever had a situation like I got with covid, and the actual covid symptoms were minor (after the first day, which was a weird intense generalized weakness that eventually went away.)

Covid is a cold, anyway. A strong, strange cold.

My cold sores will break out after any sort of physical stress (excluding exercise). Ironically I get them most often after heat exhaustion.

Aren't most variants of cold and flu members of the corona-family of virus? If so, it would seem logical that COVID also being a coronavirus would have the same (or at least extremely similar) effect on cold sores as other members of the same viral "family" would cause.