He may, however, be thinking of an outright GRANT of money for childcare - I forget the term - where it's just 8k, period, irrespective of however much you pay in taxes. I could probably think of a dozen ways that won't work - for one thing, if someone gets a lump sum in their mailbox intended to cover a year's costs in childcare - more than likely it's not going there. Understandably money is fungible, but most people budget month to month, not yearly. The current method works just fine. The best way to implement it is to increase the reimbursement rate for the dependent care credit.
I don't know what's bouncing around in his empty head. But yes, a 'refundable tax credit' similar to EITC. Less than 50% of filers pay any federal income tax to start with , so a regular credit doesn't do them any good. A refundable credit pays anyway. Not really a credit but a subsidy.