Actually no, that was the assumption you made in your original post. You communicated that ACA appeared to be responsible for saving 30 young adult lives a month.
So even if we assume your 2.3 million new insureds due to the ACA denominator has a net result of 360 saved lives in that age group, it’s still an underwhelming statistic. Perhaps less so than the overall population compared to lives saved, but still underwhelming lives saved would be less than .02% of total insured.
But even then, you cannot attribute that lives saved number wholly to the ACA. As you are aware, emergency medical care was still available to that same “uninsured” group prior to the ACA. Some percentage of that 360 saved would take advantage of emergency medical care if ill enough. Perhaps a high percentage, because even under the ACA due to its ultra high deductibles, the decision to see a doctor still has a considerable financial impact to the insured similar to an uninsured’s er visit. Likely only a small percentage of that 360 would actually be directly saved by the ACA due to access to better care management for their condition.