I believe the sort of general sentimentality of the article was akin to "It's not so much offensive as it is lazy." I get that. But that is arguably what defines the Forgotten Realms is that it is a sort of "lazy" assembly of its various parts and pieces of real world regions and cultures. (Sorry, Ed, but it is lazy.) Faerun is a lazy mishmash. Let us pray that the author does not also glance at Maztica, Zakhara, or Kara-Tur.
I'm no PoC, so take my following comments with a grain of salt.
I guess I agree with your statement. FR is a (culturally speaking) often lazy adaptation of various RL cultures. As a European, I can see strange mish-mashes of various stereotypes all over Northern Faerun and I have to admit that the most redeeming part of the setting was the general idea of magic and the interdependency between the divine and mortals. (Oh and the bad guys were usually cool as well. At least to a 18 year old girl which I was when I first read through the Campaign Setting).
I guess Kara-Tur or Zakhara or Maztica or Chult might feel similar for someone who's from Asia (not all of Asia is a mix of feudal Japan and Chinese folklore) or the Middle East (although the Persian empire did span over a vast area, it became a LOT more complicated during/after the middle ages) or Middle/Southern America (don't just mix up Mayans and Inka and jungles and human sacrifices ...) or, as said, Africa.
Now I do like racial and cultural diversity in a setting, as well as having maybe settings which specifically use only one region of the world as inspiration point to take a deeper dive into a variety of sub-cultures.
7th Sea uses a multitude of RL-inspired mythical european cultures as basis. the Avatar-verse uses Chinese, Japanese and Inuit cultures and adds its own mythological stuff on top of it. Zeitgeist mixes up southern America, victorian England and an overall pretty black populace as well as it makes its "elves" based on indian cultures and myths.
Now I think what should be really avoided are harmful stereotypes. And I guess we should ask someone who's from that origin point whether a stereotype we might have used in our writing is too much or even harmful. For example, I'm from Germany. And I'm so annoyed whenever a "german based" person or a "Germany based" region in a fantasy setting is somehow related to this setting's version of Nazis and autoritanism or is overly focused on overly masculine traits like hardness and steel (We're not all metalheads

). I don't mind as much when it comes to using a stereotypical inventiveness/focus on science or orderliness or a complicated beurocracy or a strange, stern humor. Because there are stereotypes many of us like to laugh about
