Are exposure from imp/demon/archdemon crowns improved by mastermind of discord ?

I currently play a flameslinger build and I use KB socketed in a demon crown to apply esposure on hit instead of using wave of conviction.

I wonder if the exposure provided by the demon crown (-10% res) is improved with mastermind of discord (-25%, so -35% total), because the description in the item say "unscalable value", so now, at almost level 98 I wonder if I didn't wasted an ascendancy all the time lol. I couldn't find answer on poe wiki and pob don't adjust dps with exposure afaik.

Thanks in advance.

yes. The passive does not say anything about scaling some values of your helmet. It improves any exposure you inflict.