There are no expert sources that describe the 737 MAX as dynamically unstable.
Not many people would be in a position to know this. Random aviation "experts" certainly aren't going to know the detailed flight envelope characteristics of a particular aircraft model.
Hacker News is a place of discourse. If you think I'm wrong and my sources are wrong, point out specifically where and provide counter sources to validate and support your position.
No one is going to take your word for it.
https://en.wikipedia.org/wiki/Peter_Garrison
How would this person know in detail the aerodynamic characteristics of the 737 MAX?
The other article you link gives no source for its claim, expert or otherwise. You should also check the comment by Jake Brodsky on that one.
There are many sources that reach the same conclusion.