The people getting on Medicaid under Obamacare were not previously eligible. Obamacare EXPANDED Medicaid ... meaning it relaxed eligibility requirements so that vastly more people now qualify for it than previously. They also got rid of the asset test.
At least half of the projected “newly insured” were to come from expanding Medicaid. This was part of the law.
A huge number of the signups WERE eligible. Although the liars will not tell you that.