The number #1 rule of lawyers is: Don't ask a question in court that you don't already know the answer to.

The number #1 rule of those in power is: Don't try to enforce a rule that you can't.

The gov was never going to try to actually enforce Exec Order 6102, but thats because its real goal was more subtle.

Before EO6102, most financial legal contracts had "gold clauses" in them (that is a clause that optionally priced the transaction in gold ounces and gave the creditor the option on how to collect)

The effect of 6102 was that it made "gold clauses" effectively illegal. There was no way to legally include a gold clause, since the inference was the parties would be illegally owning gold.

This effectively demonetized gold (removed it as a unit of account) and thus officially converted the economy into a "pure fiat" system.