Exactly right, which is why I cringe at blanket statements like the one made above, “No reason to stop training if you’re sick.” That is bad generic advice, in my opinion. Sometimes one or two days off to get clear of major symptoms can save losing a week by trying to train through.
I have a client who any time he feels any kind of sick wants to take a whole week off, and we work on that, because I agree that’s detrimental. But there’s a middle ground between “ride anyway” and “take a week off every time”.
My go-to rule is if I’m taking something to manage symptoms, especially some kind of anti-inflammatory, I don’t train.