ICMIZER doesn't require a tracker. If you have a hand history text from a wide range of supported rooms, you can load them in ICMIZER.
But you don't need the hand history text either, you can review live tournament hands by manually plugging all variables in ICMIZER - stacks, bets, payouts, etc.
So even if you are reviewing a hand from an offline event or from a poker room that doesn't allow hand history text export or with hand history texts that ICMIZER currently doesn't support, you can still use ICMIZER to review strategy there. Having the hand history text just makes the process faster and allows you to review more hands per hour.