Whatever this is supposed to be criticizing exactly, is misplaced and doesn't matter, because they are right about the limitations of openscad and the real world problems that result from those limitations.
You will discover these problems while still green, and their report is corroborated by anyone else who has used openscad.
You could try it yourself and discover that what they said is true.
If you've tried to use openscad to model more than a cube, then you have run in to the limitations. If you have gone on to spend years building models in openscad, then you know even more limitations and problems than you did while "green".
Even people like myself who use openscad for as much as they can because they love being able to describe an open source model in about 1k of human readable, editable, parametric, gittable text instead of several megs of xml or binary, even we will say that this is all simply true. the more experienced you are, the more you know how true it is.
I will still call myself green because I will simply call myself green about almost everything as simple facet of my character, regardless how many years or how much work I've done with something.
Should such people not advise others on what they have learned? Do self-proclaimed experts largely give better advice than experts, or even mere practitioners, who don't like to self-aggrandize?
Regardless, in this case their statements were all sound. As someone who has spent a lot of time figuring out methods to get things done that a new user would not know yet, I have no notes on this greenorns opinions.