Iodophor does not stay dissolved in solution for a very long time, maybe 24-48 hours, if not in a sealed container. If the blow off bucket was exposed to to the atmosphere, it’s likely that the vast majority of the Iodophor has returned to the atmosphere. Was the blow off solution clear, or still an amber color? If it was clear, there’s little to no Iodophor left. It may be hard to tell if there’s a lot of yeast in the blow off bucket.
Adding this amount of solution back to the beer will cause more problems with flavor dilution and scum from the blow off than human toxicity from residual Iodophor, IMO.
It was still an amber color. My buddy dumped it before I could taste it, unfortunately.
One of our other friends who brews, thinks maybe an off flavor he used to get came from Iodophor. It stopped as soon as he switched to starsan. I had been hoping to taste it to confirm if this batch had that same flavor. Personally I’m thinking he had an infection of some kind in one of his kegs that he just wasn’t managing to kill with Iodophor.
Oh well, there will be plenty of other learning opportunities.