It is also odd that they said "in a jetpack" rather than wearing or riding on/under a jetpack. Might this also be a very small but conventional aircraft? Might it be a mannequin mounted inside a smaller drone? Size gets distorted in these situations.
(FYI those hobby jets are one option, but there are considerably more capable small jets available, mostly used for cruise missiles and heavy drones.)
(FYI those hobby jets are one option, but there are considerably more capable small jets available, mostly used for cruise missiles and heavy drones.)