This article acts as though design choices which are sub-optimal from a purely informational perspective, but which add personality and attraction to a product, have not earned Apple hundreds of billions of dollars in the past 25 years. The fact that he cannot understand where the idea comes from is okay, since he's not a product, UI, or industrial designer for Apple: that's their job, not his. The deeper question of why people form attachments to things that look 'cool' but have lower performance in some areas is indeed mysterious. But relentlessly pursuing that phenomenon has worked for Apple pretty well so far.
Liquid Glass isn't immediately impressive to me either, but it will either succeed or fail not based on whether it is more effective or not, but whether people like it or not, and those are two different things.