That said, based on what we know already, there is no reason to take everything is this article at face value necessarily.
Firstly, if anybody isn't aware of the history of Stuxnet, it's worth reading, because otherwise you'd underestimate the government's ability to use 0-days by an order of magnitude (we're talking full custom-written multi-month hacking projects with root-kits and custom fake drivers delivered successfully to an airgapped system, source wikipedia). Also worth learning about Dual EC DRBG debacle.
Secondly am immediate friend of mine worked at a FANG company that routinely sent a firehose of all sorts of things matching all sorts of filters directly to governments. In fact many ISPS have back-doors built in and that's not really disputed (wikipedia: room641A).
So the question to ask yourself is -- if this was a deliberate interaction that cloudfare was required to participate in via a warrant, would they legally even be allowed to publish a blog post that contradicted this?
So I think that is probably the default attitude of skepticism you are seeing, which in my opinion is a good default. Plus the primary claim of this article "Look it wasn't 1 routing issue, it's been happening for even longer! Therefore nothing to look at here!" seems really weak.