What are you quoting, because I can't find that text in the article!?
The two weeks reference was in the reddit post the blog post linked to.
https://www.reddit.com/r/ExperiencedDevs/comments/nmodyl/dru...
> He fire me? I'll just pick up a new job in 2 weeks.
And... yeah... the reddit post is from 5 years ago when the job market was very, very different.
It was about getting fired (your manager stuff) and then moving to another job very shortly afterwards (the two weeks is correct)