cellulose insulation outer wall EKOMER

[Evi]

Karlsonhus uses the EKOMER concept with 300mm cellulose insulation. They state that it breathes, insulates well, and is fireproof. I am interested in the EKOMER concept, but how can cellulose be more fireproof than stone wool/mineral wool?
In my world, the engineer's, it's not so. What have I missed?

 

[Heureka]

From cremab.se: "Contains borate and ammonium polyphosphate which consume oxygen when heated. Conducts heat significantly worse than, for example, glass, stone, or steel. Reduces the risk of fire spread. Does not emit toxic gases. Same fire classification of constructions as with stone wool at the same thicknesses. Protects the construction in case of fire and provides a few extra minutes before the building collapses, saving lives!"

Where does it say that cellulose is more fire-resistant than stone wool/mineral wool?