Googling shows that they have some deployments but at least as far as I can tell from my network settings (and http://ipv6-test.com) I do not have an IPv6 address. Perhaps they never got around to updating my apartment building.
My ISP (Spectrum) only enables IPv6 to a subset of their "supported" cable modem list. In other words, if you don't have the right cable modem, you may get IPv4 but don't get IPv6.
It's possible your provider may do the same.
Charter includes the modem with their plans though, so why would you not just ask for an IPv6 approved modem? Its not as though they charge an equipment rental fee like Comcast or Cox...
I think some buildings are actually outright cg-natted and the only IP you actually get is v6...
A gigabit switch is a heck of a lot cheaper than a 48 port router or a basic Linux box with proper VLANs and tagging on the switch. These were also likely configured in the early days of Webpass, so they prolly won't touch it unless it breaks.