It's also worth noting he's not actually retired, he's actually a self-employed handyman and also says in the article his wife works too and plans on working more when their boy is older.
If you're working for money you're not retired. There's even a whole spiel in the link above about how they tried to become property developers which failed when the market collapsed, which is actually a lot of work.
I'd buy semi-retired. Or he works part-time. But retired has a very specific meaning that he is ignoring. He just seems to be confusing 'I enjoy my new job' with 'I don't work' just because he didn't like working 9-5 as a programmer or whatever it was he did.