That's a bunch of hooey, and is not a "chemical law". Just because you read something on the internet andit appeals to your fancies, does not make it true.
Example, people ingest far more chloride than bromide. If that hokum you posted were true, then there would be no bromide in people. But this is not what is found. We find that Iodide displaces bromide. So, stop posting this junk or you'll find I shall discredit most, if not everything, you write.
Fluorine does not exist in the body, neither does bromine. Any high school chem student knows that these do not occur in nature, because elemental halogens are highly reactive. Cut and paste is not a Science earl grey, and it doesn't make you smart or help anybody when you post nonsense on here.