I found the premise of this article [0], that throttling connections (based on SNI) is new, a little amusing. It reminds me of how Iran implemented a very similar technique almost a decade ago [1]. I don't know of earlier uses of throttling as a censorship mechanism, at this scale, before the early-2010's (but I'd be interested in learning about them, if anyone knows).
An earlier article about Roskomnadzor's implementation is interesting [2], for those who missed it.
[0] https://arstechnica.com/gadgets/2021/04/russias-twitter-throttling-may-give-... [1] https://ooni.org/post/iran-internet-censorship/#reported-cases-of-internet-c... [2] https://arstechnica.com/gadgets/2021/03/a-russian-isp-confirms-roskomnadzors...