I'm not sure the understanding of the bill's language, as noted here, is correct. In plain language, it means that Congress has appropriated - and is authorizing - FAA funds to be used for those explicit purposes listed in Section 169 of the CR. So... what does that mean? It means the FAA won't have to cut other parts of its budget to pay for those items directly listed in Section 169 of the CR.
Unbeknownst to many, one of the nastiest issues with most CRs is that Congress often fails to fully fund the January pay raise even though it is authorized by either the President or Congress. So, in order to pay for the approved pay raise, agencies must then move money from other budget lines to cover personnel costs. This is why you often read union statements calling on Congress "to fully fund pay raises" if they have to resort to a CR.