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]
Also applies to most similar phrases ending in -proof. Should be eye-opening.
Alcohol and Acetominophen/paracetamol should not be mixed.
When alcohol enters the picture, it increases the activity of CYP2E1, so the body produces more of the NAPQI toxin. Alcohol also decreases glutathione production, the body’s natural defense mechanism, meaning NAPQI is more likely to build up in the liver in dangerous concentrations.
Sorry, crappy link. If you don't like it, it is easy to search for a better one.
Your crappy source is vague in what consumption pattern constitutes a risk and actually cites a better source that supports the idea that acute alcohol consumption reduces paracetamol toxicity. https://www.biorxiv.org/content/10.1101/2020.07.07.191916v1....
That's a mathematical model, but this relationship between the two is what I was taught in medical school and it is still supported by the science. There's plenty of other sources, I just picked that one because your article cites it. Just search for "paracetamol ethanol" on Google Scholar.