
The key is the word “free” not being in the first headline. The candidates were asked about providing government-run health care in general. Bloomberg and Yang said they believe undocumented immigrants should be able to buy into the gov-run plan if the immigrants have registered for a pathway to citizenship. Yang mentioned an additional cost for them. Buttigieg said something similar but did not require a pathway to citizenship, yet noted that these people wouldn’t be able to get ACA subsidies
Biden was pretty vague. Booker, Warren, Gillibrand, Swalwell, and Harris backed Sanders’ Medicare for All. Bennet said they should have the option to purchase it on the ACA exchange (didn’t say whether or not they’d be eligible for subsidies). I won’t detail the rest but it’s here: https://www.washingtonpost.com/graphics/politics/policy-2020/medicare-for-all/undocumented-immigrant-health-care/
And for context: existing law (EMTALA, passed by Reagan) already requires hospitals to provide care for anyone — regardless of citizenship, insurance, or ability to pay — who shows up to the ER with an actual emergency (not just a sore throat). If it turns out the person would be eligible for Medicaid except for the fact they’re not documented (e.g. they have low income, certain disabilities, etc), they will be covered under Emergency Medicaid. In that case, the federal government pays for that