I'm a little unclear how you could possibly get that many interviews in such a short time unless you're a famous "rockstar" coder. I'm not familiar with the blog author, is he a very well known person?
My experience is similar to the author's, and I live in a not so well off area of Europe. I'd expect to receive dozens of offers per month if I lived in the US.
Most recruiters are just chasing quantitative metrics and don't really care about candidates being a good fit. If you have certain keywords in your resume, you are going to get bombarded with offers. One of the few negative aspects of the rise of remote working is that it has exacerbated this.
Offers as in contract and project details after one or two interviews, with no take home tests or phone screen interviews required. You basically have to agree and sign a couple of documents at that point. Lately, tech recruiters come across as desperate more often than not.
Once you pass 3-4 years of experience, it is not difficult to get at least a recruiter interview and phone screen in the US for a standard software engineer role. And that's with YOU applying — people get messaged by recruiters on LinkedIn all the time.
I have no idea what this person's resume looks like, but I believe there are a lot of jobs out there for people with certain skillsets right now, _especially_ given the massive shift to remote work. It's likely impossible to find & attend 60 interviews in a month _locally_, but when they're all remote it seems challenging but not impossible.
Most recruiters are just chasing quantitative metrics and don't really care about candidates being a good fit. If you have certain keywords in your resume, you are going to get bombarded with offers. One of the few negative aspects of the rise of remote working is that it has exacerbated this.