It's important to note that:
1) We do not know where they got their SN and whether it was pure enough. They mentioned the polish source and a local croatian source a few days before their ctb. It may have been nitrate and not nitrite, as well.
2) They did not follow the established protocol, going by the fact that they waited an entire hour to drink their second glass. They claim they went by the rules, but they didn't give any details as to what they used in their protocol.
3) Bad actors or journos can come here and spread misinfo, so a healthy dose of skepticism is good to have. Although, as I've said elsewhere, I am not saying that this is for sure a fake SN goodbye thread. But it wouldn't surprise me as anti-choicers will do anything to prevent us from taking our leave, and that includes turning people off from an established and popular method here.
Regardless, this experience is not representative of the SN experience, as has been discussed further in that thread. So when you share this particular incident, it's important to put a disclaimer noting that this is what happens when it goes wrong. Because if you're familiar with any of the SN experiences on the forum or in the PPH, this is not what occurs when SN is done right.