Medicaid is means-tested based on assets as well as income.
I can't ever see it as an option for (voluntary) early retirees.
No, the Medicaid expansion under ACA for those states that signed on doesn't have a means/asset test.
As low-income ER's living off of assets we've alternated between Medicaid and high-subsidy ACA plans depending over the past 3 years. Managing income (childless couple) to $24K a year provides access to an ACA silver plan for less than $100 a month total after subsidy. Keeping under, say, 19K means automatic Medicaid and whether that's better or worse than an ACA plan depends on the specific state and city in which one resides, in our experience.
In Tucson AZ for example same doctors and clinics for Medicaid and ACA plans but in Colorado and many other places Medicaid ends up being de facto hospital-only coverage as finding doctors that will take it is difficult. Obviously the stigma attached to Medicaid, pending work rules in many states, etc. makes the ACA plans a better choice overall for now. Impossible to plan more than a year or two out in any case which is maddening.