You're correct, EASA allows conditional clearances ("clear to land after departing plane clears runway"). But the linked event was not a conditional clearance.

You're correct, EASA allows conditional clearances ("clear to land after departing plane clears runway"). But the linked event was not a conditional clearance. The approaching jet was cleared to land, meanwhile the ATC got distracted and left the SWA jet on the active runway without clearance to take-off. IIRC, EASA requires the conditional to be explicit, with the condition named and read back, and both ATC and cleared plane to have visual on the conditional aircraft.