A runway incursion is defined as:
ICAO defines a runway incursion to be “
Any occurrence at an aerodrome involving the incorrect presence of an aircraft, vehicle or person on the protected area of a surface designated for the landing and take off of aircraft” (ICAO Doc 4444–PANS-ATM).
https://www.airservicesaustralia.com...runway-safety/
i.e. it's only on the ground, there is no airspace involvement.