Maybe so. Most of the 2023 scenarios (in particular Extended2023Muon) use the v2/muonNumbering.xml or v3/muonNumbering.xml file in Geometry/MuonCommonData/data/PhaseII/. Only the 2023 CFCal type geometries use v2/muonNumbering.xml. However, the GE21 geometry is currently not loaded in cmsExtendedGeometry2023CFCal4EtaXML_cfi.py or cmsExtendedGeometry2023CFCalXML_cfi.py, so this change won't have any effect on  GE21 (because it is not there anyway). I guess this should be corrected, to be in accordance with  https://twiki.cern.ch/twiki/bin/view/CMSPublic/SWGuideUpgradeGeom, but then we'd rather use the v3/muonNumbering.xml numbering.