Basically it seems Iodine saturation would help reduce absorption of fluoride, to what extent it isn't clear, and thus it is still best to try and reduce fluoride consumption.
I was thinking about this due to one of Dr. Tennet's videos where he talks about the prevalence of poorly functioning thyroids in our population, and he theorized that since many of us grow up on fluoridated water, and lack of iodine, the fluoride gets into our thyroid and basically we have fake thyroid hormone production.