Netgear CM1150V is on xfinity approved list.

My Netgear CM1150V is listed under mydevices as optimized for the plan I selected.  I don't see an EOL list.  Why am I getting an email from Xfinity telling me I need to migrate to another modem? The email says I already own the second modem, which is wrong (I only have the one Netgear modem). The firmware on the modem is V4.12.04. Is that the latest? I am wondering if the email is a fraud attempt by someone impersonating Xfinity?