Apple have stated multiple times that they don't have any intention to lock down macOS more or less - I can't really think why anyone would think Apple would lock down macOS. There's... really no reason right?
My gut feeling is that there are a lot of people that don't like Apple, mostly due to their proprietary nature, and they just... argue against Apple. Before the M1 appeared, the argument was that Apple's Macs are expensive for nothing, they have terrible hardware, Touch Bar is bad, software quality has declined, etc... and now it's all about the user's freedom.
Seriously people. This article is about using dev tools on the M1 Mac. Let's not start arguing about how Apple is bad for freedom, etc.