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.

I've suggested them to chat with their doctor.

Many (including myself) have been successfully living with symptoms without treatment, but seeked my eoctors advice after having similar symptoms after a similar situation, and the result was adhd medication which helped.

Suggesting that someone talks to their doctor about symptoms is reasonable advice.

Edit0: and I wouldn't go around diagnosing people with depressive episodes from a single comment, were I in your shoes. Let their practicians do diagnoses, you know?