Am I correct in assuming that the summoned monster that you fight in place of Incutilis is not considered to be a villain for things like Valeros's anti-villain powers, Blessings of Achaekek, that Tome or Codex from RotR, etc.?
Cards Do What They Say and Cards Don't Do What They Don't Say. Inculitis tells you to summon and encounter a random monster, not a random villain. The summoned monster will therefore never be a villain.
It sounds similar to the case in S&S where a barrier summons a ship, all those great anti-barrier powers you'd saved up are suddenly worthless.
Or even just RotR's Goblin Raid or Skeleton Horde.