Yes, if you believe the official health care has done a good job since the 70`ies; of treating / preventing thyroid issues, go for this recommendations.
About informing onselves before taking large amounts of iodine, another yes. I spent some hundred hours of searching, reading before I entered the VWT team. + the experience of taking Iodine in larger amounts.
Just keep in mind;
Levothyroxine; the ones I know that are on it, quite a few in the medical system; is on a never ending roller caster of up and downs. The ones that has been on it for years, have upon xray a thyroid with the size and shape of a raisin.