If SaSu is voluntarily implementing a UK geoblock instead of fighting Ofcom. Ofcom is claiming it's everyone on the planet's responsibility to implement their own geoblocks of the UK rather than for the UK to set up a GFW. If SaSu was trying to circumvent some UK originated blockade of their website, your comment would make sense, but they weren't.
Even if you hate how this guy writes, which I can agree is questionably professional at times. There's no real way to read this other than that Ofcom, instead of simply complaining that an IP wasn't geoblocked correctly, took the first opportunity they could find to restart their extraterritorial attack on SaSu. All that to avoid the presumably incredibly bad optics of implementing a GFW. Although honestly I would be the least surprised if the UK implemented a GFW soon.