How to write a "article" not a "post" on Indie Hackers?

I wanted to write a article on Indie Hackers like:
https://www.indiehackers.com/@tigran/reflections-on-being-an-indie-hacker-f5a27029b1
https://www.indiehackers.com/@csallen/how-to-write-for-indie-hackers

Any ideas on how to publish an article?