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So the article is portraying 4k blu-ray as the raison d'être for Intel ME on consumer devices, but isn't for example Netflix HD which uses HDCP 2.2 somehow also tied to a trusted execution environment within Intel CPUs, or is this method of protection only via the display and the graphics chip (sometimes also by Intel; on the motherboard)?

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The ME-based DRM provided by Intel isn't inherently limited to securing UHD Blu-rays, and you can expect Google's Widevine, as used by Netflix, to consume this functionality as well.

My understanding is that the industry has decided that UHD/4K content should require hardware-level DRM, no matter whether on disc or streamed, and that Netflix UHD requires a system with this functionality.

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