CDLA Permissive is not downstream compatible with ODbL. ODbL is a sharealike licence, CDLA Permissive (as the name suggests) isn’t. Overture can’t relicense OSM-derived content under CDLA Permissive.

From a brief skim of the landing page, it looks like the OSM-derived content is not being offered permissively. See https://overturemaps.org/download/.