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"You do not seem to have read the article ... unless you have insights into the Apple design process, there is no where stated anything about modular design."

Actually "modular design" is in the first sentence you posted. :-)

I have a fairly high level of interest in this and have read a few articles. A different one had a lot more quotes from the Apple folk, among them:

“As part of doing a new Mac Pro — it is, by definition, a modular system — we will be doing a Pro display as well. Now you won’t see any of those products this year; we’re in the process of that. We think it’s really important to create something great for our pro customers who want a Mac Pro modular system, and that’ll take longer than this year to do.” - Apple Senior Vice President of Worldwide Marketing Phil Schiller

https://techcrunch.com/2017/04/04/apple-pushes-the-reset-button-on-the-mac-pro/