That study does not match your tone, it implies that eating them together makes them very slightly less good and healthy across just one particular nutrient tha

That study does not match your tone, it implies that eating them together makes them very slightly less good and healthy across just one particular nutrient than they otherwise would have been separately, not that putting them together makes two healthy things combine into one unhealthy thing. That said, I'm a fan of processing as little as possible, and I imagine a fruit salad of those two things would still suffer from this effect just as the smoothie, but surely not to the same magnitude, there's just bound to be less total mixing. The bigger hedge is just to have a varied diet. All in all though it seems an oddly medium-low importance thing to bring up in context?