Interesting article. I think at some levels - all human beings have some sort of imposter syndrome.
In some cases, it is aggravated by a competitive environment. In other cases aggravated by a perception of a competitive environment - even if it's a properly interesting collaborative environment.
Your article covers well a range of interesting points for us to keep an eye on - but I would add another one: understand your environment.
Toxic environments or highly competitive environments are not interesting for anyone and we, as professionals, should understand what are those and tell tales signs of "bad".
All in all, self-knowledge is super important and I'd recommend for everyone investing a bit on this. It will help you as a life-long learner, as a professional and a human being.
Again, good article.