Yes I’ve read the same article that your paraphrasing ( HERE
) - The reason vinegar works is it’s hypertonic to the cells it surrounds in this situation, the same reason urine works (works even better if your dehydrated as your urine is a more concentrate hypertonic solution) – this is also the reason Diphoterine works, it moves water out of the cnidoblast (the cell containing the nematocysts before they are ‘fired’) to equalise the net-loss in solids of the surrounding solution, this in laymans terms forms a water bias under the cnidoblast so you can wash it off your skin as the water passes through the hypotonic cell easier, being smaller than the solid molecules it cohabits with, dehydrating the cnidoblast cell - much like drinking salt water will kill you.
The study into Vinegar aiding nematocysts agitation, isn’t as ‘dubious’ as lauded by some researchers. The study is sound, its control works and it’s mechanism for firing is also sound. Electric stimulus is common practice to simulate cellular activity and if the control is ascertained correctly (i.e saline solution sterilisation, which you would find in real-world as that’s basically where jellyfish live) and noted a net-gain when you add a catalyst, it would be a perfectly acceptable hypothesis that that added solution is a catalyst. It is one of the more ‘real-world’ in vitro tests I’ve read.
The mechanism for this is the real question?
The active ingredient in Vinegar is the acetic acid, Diphoterine has amphoteric molecules (react to acid/bases alike) would be equally as useful as vinegar as it would ‘complex’ with the venom in both ways, reducing toxicity volume – regardless if the study is correct or incorrect.
It’s very new stuff, i haven’t seen any peer reviewed studies into its effectiveness, other than actual cases of someone using it and noting relief. It just seems chemically, more useful than vinegar...as vinegar which I've explain simply reduces venom volume by hypo > hyper tonic reaction...chemically, it doesn't do much else.
P.s - the rabbit thing was in relation to it working on Sulfuric Acid burns to eye's, as I've never seen a solution nullify chemical burns and stimulated cell-repair so fast in my life, freaking amazing...nothing to do with Jellyfish though.