Medicaid expanded under the ACA, so I doubt it was the ACA (as opposed to income or recovery from disablility) that pushed him off of it (though
Pennsylvania did try their own thing in 2014-2015 before switching to regular Medicaid expansion).
According to
this page, assuming he's single and works exactly 40 hrs/week at $15 ($31200/yr income), and assuming I did my calculations right, post-subsidy caps should be $221/month, but I'm guessing those assumptions aren't completely accurate.