I haven't digested the whole new Cybersecurity EO, but I did skim for AppSec-relevant stuff and it seems like it rolls back some of the standardization push.
Orgs no longer need to universally supply #SBOM docs or produce machine-readable #SSDF attestations. BUT, any agency that codified those requirements doesn't have to undo them, and it seems like agencies can still adopt those requirements on their own going forward, too.