1. Whether Congress gave rulemaking power to the FTC under the provision cited supporting the ban on non-competes, and
2. Whether, assuming FTC had been granted the authority by Congress to issue the rules, it acted properly procedurally under the Administrative Procedure Act when it did so.
The court ruled "no" on both.
(I haven't reviewed it in detail to have an opinion on whether it is correct on either point; banning non-competes is good policy, and it would be good if Congress did so directly.)