That's a common type of scam on YouTube. One bot will say how someone changed their life by investing their money, then the rest of the replies (also bots) will ask for the person's name to feign a lot of interest. Then they set up a fake Instagram profile using that fake name for people to search for, who fall victim to the scam.I suspect that these ones might be bots too. A chain that he didn't carefully look into because he's so desperate but hasn't had time to hide the comment yet.
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I wouldn't be surprised if he's started or always been buying comments. Buying views and comments is much less risky than buying subscribers, which can get you quickly banned on YouTube.