No indication that this feature is gone see here:
http://www.charter.net/support/tv/caller-id-tv/
However, amoung the popular calling features from Charter, Caller ID on TV is not listed:
(Probably because Digital Cable TV is also required.)
https://www.charter.com/browse/content/phone
The requirements for Charter Caller ID on TV seem to be the same as for TWC Caller ID on TV.
Requirements
Digital TV Service
Caller ID on TV is only available if you subscribe to a Spectrum Digital TV package.
Spectrum Voice Phone Service
Caller ID on TV is only available with select Spectrum Voice packages.
Basic phone service does not qualify for CIDTV unless you purchased optional Caller ID.
CIDTV only works with the primary phone number. TV call alerts do not appear for incoming calls on secondary phone numbers or distinctive ring numbers.
http://www.charter.net/support/tv/caller-id-tv/#/Requirements
Satch