No, you do not cross the International Date Line when traveling to Kigali, Rwanda.
Travelers from the Americas or Europe to Kigali cross multiple time zones (e.g., New York UTC-5 → Kigali UTC+2 = 7-hour difference), but the IDL is not involved unless you route eastward across the Pacific (e.g., Tokyo → Kigali westward does not cross IDL; Los Angeles → Tokyo → Kigali crosses IDL once).
Any date change comes from time-zone transitions, not the IDL. For example, flying London (UTC+1) to Kigali (UTC+2) moves the clock forward 1 hour; no date change occurs.
The original statement confused the Prime Meridian with the IDL and mislocated both.