I have to agree that this is a weird post. GCC took a decent paying job, worked a few hours at it, made a bit of money and... the end. Not much to say beyond that.
If he actually NEEDED money it seems like he could have done the full 8 hours+ per day, 6 days per week and made about 3 times what he earned. $10,000 makes a real dent in most FIRE'd withdrawal rates.
Eh, I can kind of speak to this as someone who doesn't really need to work and yet is constantly on the lookout for interesting jobs I could do.
I like working and I like making money, and I could just commit to a certain amount of full time work and make a bunch of money, but I don't want to.
It's more like I like to do all sorts of things and projects that pay me sometimes sound interesting.
Sometimes I start them and quickly think "FUCK THIS, I HATE THIS!" and I walk away. Other times I'm like "ooh, this is fun, I don't even care that I'm making a fifth of what I could make, I like the challenge, the conversations are great, and I'm learning a new skill, why not spend some time doing this?"
The calculus around work and income changes dramatically when. You don't really need it, but also don't mind working for money.
I completely understand where he's coming from, I could essentially write the same thing about some of my experiences.
Hell, I'm going in for major surgery tomorrow with a long and very unknown recovery timeline and I was literally doing an interview at 5am with a company from India who are interested in a consulting partnership for medical professionals.
Maybe I'll do it, maybe I'll be too fucked up to do it, maybe I'll take extra courses instead, maybe I'll start a new home reno project, maybe I'll take on a new volunteer role. Maybe I'll even get more shifts at the super random part time job I already have, and weirdly really enjoy, but rarely get called on to do.
Who knows?
When your time is wide open and you are FI, work isn't really something you do for money, work is just a thing you can fill your time with, and sometimes the things you fill your time with pay you money, because why not?