Assuming you found a way to spend colorless mana on casting Extortion (say there's a Sphere of Resistance on the battlefield or something), your opponent can still pay half their life to the cast trigger, but it won't counter the Extortion. That cast trigger is an ability, and Boseiju makes it so that ability can't counter the Extortion.
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I'm a former judge (lapsed), who keeps up to date on rules and policy. Keep in mind that judges' answers aren't necessarily more valid than those of people who aren't judges; what matters is we can quote the rules to back up our answers. When in doubt, ask for such quotes.
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Can't be countered rulings question