Does making Explorers not participate in Ravage (e.g., with Lure of the Deep Wilderness) prevent "Competition Among Hunters" (The Tsardom of Russia Level 3) from causing Ravages?

Does making Explorers not participate in Ravage (e.g., with Lure of the Deep Wilderness) prevent "Competition Among Hunters" (The Tsardom of Russia Level 3) from causing Ravages?

Yes.
Since "Competition Among Hunters" modifies which lands match Ravage Cards, it only checks for Explorers that are participating in Ravage.