No, they’re correct. “End up being” does not imply that you ignore the existing track record. That’s why OP clarified “only if you ignore their existing safety record” - given that other planes have had 0 crashes and 0 fatalities, I’m not sure how the 737MAX could even ”end up” being “safer” even if you ignore existing issues - you can’t get better than 0 issues, so at best it would be as safe as most other aircraft.