This is far broader. No where in the Subscription Agreement[0] is the scope or the uses defined or limited. From what's written here, any form of information sent to Comcast in any way will can be stored and monitored for any purposes.

IANAL, but this seems like clever lawyering to make consumers think they're only referring to customer service calls.

[0]: https://www.xfinity.com/corporate/customers/policies/subscri...