I don’t disagree per se, but the article says that the plane operates at 20,000 meters ceiling, Wikipedia says SR-71 had 26,000m operational ceiling, so this thing is high up, but not as high as the blackbird. Not sure how much of a difference that makes for the air and heat issues.

The company that makes this thing is making ballistic super sonic rockets for China, so I think the implication in the article is that this thing is basically a rocket with wings.