I just made a package to deal with this really cleanly.
thislooksfun
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If you used something like Crashlytics or Sentry then the answer is yes, you have to declare it, but on the privacy - https://developer.apple.com/app-store/app-privacy-details/#additional-guidance details page it specifies "You are not responsible for disclosing data collected by Apple". I am interpreting that to include Apple's own crash reporter.
That being said, I am not a lawyer, and if Apple releases an official statement on this one way or the other, do that. Until then, I'm not counting it myself.