It's not ambiguous in the context. And normally people don't bring the sorites paradox to definitions of words that describe gradients -- we can describe something as cancellation even when there are more severe cancellations that are possible.

The question wasn't asked in good faith, as much as I appreciate the courtesy of the respondent. You can read that user's twitter and see that they were already familiar with the term and they believe only Nazis complain about it (they posted a graphic novel panel indicating this.) They were only asking for clarification in hope of getting an answer they could exploit in some way.