Mid February has been talked about as a date for a decision.
I'm sure you're right that the UK doesn't have a full picture of the situation in SA. Given current testing levels, does South Africa? What's the current positive test percentage? This seems a more indicative metric when testing rates are at a low level. Unless you're pro-covid, I wouldn't fear a lockdown. I fear that we went into our current one too late and will come out of it too early. I would be much more afraid of a government who place their own popularity over doing the best thing for public health and the economy.
As far as I can see, the Covid situation in SA is an irrelevance though. The SARU have said that they don't see the tour as viable if matches are played behind closed doors. In a country on a steep upward curve, without a vaccination programme in place, there's more chance of porcine aviation that full rugby stadia in the time frame we're talking about. As I've said further up the thread, either the SARU are confident that they can strong arm the other stake holders into doing what they want or have been very naive in making the statement that they did. It strikes me that they're running the risk of turning down 50% of something in the pursuit of a greater percentage of what they were expecting in the first place.