A time traveler from the 17th Century would be familiar with this sort of quackery. I guess not everyone can sell alchemy, so some make do with other branches of “science”.
From https://en.wikipedia.org/wiki/Chlorine_dioxide#Safety_issues... the EPA "has set a maximum level of 0.8 mg/L for chlorine dioxide in drinking water", which is certainly much higher than the amounts in MMS.
From https://en.wikipedia.org/wiki/Miracle_Mineral_Supplement (for example) - "Following a May 2010 advisory which indicated that MMS exceeds tolerable levels of sodium chlorite by a factor of 200".
Summarising, the idea of toxicity of chemicals and dosage was first explored by an alchemist (Paracelcus) in the 1500s, which is the 16th C. - so yes, 17th C. medics might have been able to point out how crazy this all is, let alone 21st C. people of any kind.
It's been 500 years, people.
The War On Ivermectin – Jenna McCarthy
Written with Jenna McCarthy, Dr. Kory’s story chronicles the personal
attacks, professional setbacks, and nefarious efforts of the world’s major
health agencies and medical journals to dismiss and deny ivermectin’s
efficacy.
jennamccarthy.com/portfolio-items/the-war-on-ivermectin-cloned
Seems to be, yeah.