>Could this very well just be increased access and availability to Narcan

Without looking up data right now: yes

edit: whoever claimed my comment is inaccurate should look at the stats for Naxolene usage on opioid users (https://www.health.ny.gov/statistics/opioid/data/pdf/nys_jul...). In one (1) county, they administered Naxolene to over 6,000 users. With that information, arguing there is no correlation between the wide spread availability of reversal drugs and the drop in deaths is just.. wrong.