Yes, and you can still die in a car crash if you're wearing your seatbelt, and wearing a helmet on your motorcycle won't save you from a head-on with a truck, and you can still drown in a pool with a lifeguard, and you can still die in a burning building with smoke detectors.

Harm reduction is about shifting probability distributions, not guaranteeing outcomes. Kids can still get into pill bottles with childproof medication caps, but accidental ingestion of aspirin by children reduced by 40-55% after they were mandated. [0]

[0]: https://pubmed.ncbi.nlm.nih.gov/440889/