I don't believe it can be an "incursion"
From MATS Part 1 Section 2 Chapter 1 Page 6 para 7.6.2
"A runway incursion is any occurrence at an airport involving the unauthorised or unplanned presence of an aircraft, vehicle or person on the protected area of a surface designated for aircraft take-off and landing."
If a Conditional Clearance has been issued then it is both an authorised and planned movement.
DD