ADHD isn't a condition which spontaneously appears mid-life following an obvious difficult event like losing one's job for an extended period.

The comment was clear that these symptoms appeared after the job loss. It's a match for the symptoms of a depressive episode (which can and does appear after a difficult life situation) but not ADHD.

Suggesting that the commenter seek out stimulant medication is not good advice.

He is unemployed which likely means he has no doctor or that high end health care if the sort you’re assuming is not something he has access to. Poor Americans can go to the ER, but talking to someone with knowledge and capacity to prescribe psychotropics is not how this works.