The Infrared Lenses’ “20% increased damage to Burning enemies” does not increase the damage of the burn caused by the Power Incendiary Blast (and probably Calamity too). Other damage does get increased correctly while they are burning from Incendiary Blast, but not the burn damage itself.
It does increase the damage of Ashe Dynamite burn, so I think it should also work the same with the burn granted by powers.
Tested this in Practice Range, so take with a grain of salt, but please look into it once