His intention isn't to undersell himself, for whatever reason it's very favorable on this site to tell people how you have decades of experience working in this field but can't write fairly basic data structures or algorithms. It comes across as very likeable and personable and gives people hope that they too can spend decades working in a field making a better than average salary without ever having to master the fundamentals of their job.

The reality is that if this person's life really did depend on it, for example they lost their job and they have bills they need to pay or a family they are responsible for taking care of, then they almost certainly could put in the effort to brush up on their skills and get to a point where they could do leetcode easy or leetcode mediums in a matter of weeks or a month at most.

It's along the lines of an MIT grad saying that where you go to school doesn't matter or a rich person saying that money doesn't make you happy, or even the myth that Einstein failed at math. These statements that espouse a false sense of modesty have great appeal and they likely come from good intentions, but ultimately they give people bad ideas about what it takes to be a fairly competent developer.

> Anyway, the most important skill for FAANG interviews is ability to write code on a whiteboard with a dried out marker.

This would be a good April Fools ecommerce site. "Dried out markers! Guaranteed to land you a job!"