Eyes to the South offers slightly more information. An internal power struggle between the military and political faction was resolved when the military faction killed Ramdane. (See page 30)
Another paper suggests,
The leaders of the interior, under extremist Ramdane Abane, held a
conference in the Soummam Valley in Algeria and did not include Ben Bella and those of the exterior. This conference created a legislative board, the Conseil National de la Révolution Algérienne (CRNA), which was responsible for making all military and political decisions, and an executive board, the Comité de Coordination et d’exécution (CCE), which was in charge of all the FLN’s other organizations. Every leader on these boards came from the interior of the country.
Both of these are consistent with the stated source and each of these sources provides additional citations for further research.
'Cult of personality' is revolutionspeak for 'you're more popular than me, and I'm in danger of losing control of the revolution. Since control of the revolution is always more important than the goal of the revolution, 'cult of personality' is a crime punishable by death.