yep, just get the dilution ratio right and wear a pair of gloves. I have lost zero corals to bayer dip.I'm not the person that you posed this question to, but I'm sure they were not kidding. Bayer insecticide is very commonly used as a coral dip.
I use Bayer on every coral that goes into my tank and it has never caused an issue. I too thought using an insecticide for a coral dip seemed extreme but from my understanding it only effects organisms with a central nervous system which corals do not have. So on a coral it is not harmful at all.