According to the Visual Signaling guidelines I can find, eVDSDs seem to still be only acceptable for night use, and do not qualify as acceptable for daytime use. Can you advise where USCG has updated that? At the current time, are there eVSDs that are SOLAS compliant?

Bob, you are correct, eVDSDs are only approved as a night visual distress signal, that is why in the package for both of the Sirius Signal products, the one color C-1003 and the two color C-1002, we include a Daytime Orange Distress flag that is USCG Approved as a Daytime Distress signal.
At this time there is no SOLAS standard for an eVDSD.