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I've observed a Black Blade of Disaster making an impact on experience gains. Without it you'd get Experience gained messages, with it, you wouldn't.
It's the Black Blade's CR that drains it, yes. If you use it in trolls you'll never get exp, but sufficiently difficult dungeons (like Veidrava) will still grant it.I think the summons count as an additional PC, so their CR counts toward the EXP calculation.