Yeah that's not enough to retire on, and it's def not enough to put it all in one investment, but if he got divorced at the end of his career that could be all he had left. His optimism and hustle, although in my opinion completely misguided (McDonald's would probably hire him back for more than $15 an hour, hell you would do better mowing grass), his grit and determination is to be admired.
It caught my attention because I'm thinking of building a tiny house to use as an rv so I have cheaper and better living conditions when I'm working away from home (I'm in a hotel as I type this). As I started researching tiny houses and rvs, I found many articles highlighting the fact that a large population has given up on full size houses because they no longer could afford it after the recession. Quite the eye opener, and quite depressing if you think about it.