uhm.. u must have not read your own link. you are reinforcing his correct statement.

A flammagenitus cloud can help or hinder a fire. Sometimes, the moisture from the air condenses in the cloud and then falls as rain, often extinguishing the fire. There have been numerous examples where a large firestorm has been extinguished by the flammagenitus that it created.[4] However, if the fire is large enough, then the cloud may continue to grow, and become a type of cumulonimbus cloud known as a cumulonimbus flammagenitus, which may produce lightning and start another fire.[5]

yeah ok under lightning causes another fire lol sure, whatevs wiki. we get the point.