I misspoke a bit here. For an orbital vehicle, yes absolutely. Since this vehicle has a relatively shallow suborbital trajectory, I assumed the vehicle has a 1st burn to reach an apogee of ~100km. Upon reaching apogee it orientates itself towards it's earth-bound target, and then executes a second burn. Thus accelerating under thrust towards it's target. Ergo it's maximum speed would occur somewhere between it's apogee and when it re-enters the atmosphere. At least that was my interpretation of the text in the article.