I may not be doing the article justice, but it seems a bit misleading how this is presented. The title reads almost like "science clickbait" and there's a lot of talk about "safe" and "lower risk" but the study seems to only have actually computed lethal dose. This is an almost entirely useless statistic from my perspective, and by presenting it as justification for any sort of "safeness" seems almost deceptive. They do nod to this with a small section on the other impacts of use, but it seems heavily deemphisized when compared with the core message.
Here's hoping I'm just reading this wrong and looking for the worst possible interpretation; I just worry that when presented without an even hand that these sorts of statements will only impede the goal of more reasonable drug policy and culture.