Verified answer

Terminal velocity occurs when air resistance (force upward) is equal to the downward force (weight)

For his case he must have continued accelerating, as long as air resistance is not equal to the downward force he will accelerate.

This can be done in a diving position, reducing the effect of air resistance. + he was spinning at some time, so centripetal force gave him extra speed.

There is no other explanation! He did not break any physics law.

Terminal velocity can be applied to a parachutist as they open the parachute for example, terminal velocity would be reached.

he was so high up that the air was very thin. so air resistance was reduced massively allowing him to accelerate to beyond the speed of sound. he would eventually begin to slow down as he got closer to the ground