I'm yet to see a red buddleia, at least to my eyes, but there are plenty of dark pink ones that aren't far off. I have a nice dwarf one that I think is ruby red (or similar).
I have flower power which has red in it but it's not been very impressive for me tbh. Dark knight is my favourite and it flowers really well, as does my white one which steals the show because the flowers are so obvious (but needs dead heading as they fade quickly).
I've never seen a true red one either, but good to know they are possible. I would say that pinks, purples and reds can vary hugely, depending on things like degree and intensity of sun exposure. I imagine soil make up and age of the bush and bloom might change matters. A plant that is a true red in one garden (or even in one year) might be quite different at another time or or place. So, caveat emptor.
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I have flower power which has red in it but it's not been very impressive for me tbh. Dark knight is my favourite and it flowers really well, as does my white one which steals the show because the flowers are so obvious (but needs dead heading as they fade quickly).