Seems to be a lot of people there don't know what BT are doing.
That thread means Sky are implementing WBC and IPSC over WBC just like Entanet - though hopefully with better backhaul links.
It doesn't affect the LLU products at all. It just affects Connect.
The effect of WBC is that for Sky Connect customers they can offer up to 20Mbps connections on BT WBC-enabled exchanges, handing over to Sky at 20 nodes. On non-WBC-enabled exchanges they will be offering the current up to 8Mbps, but over IPSC which hands over to Sky at 10 nodes. The IPSC nodes are at the same places as 10 of the WBC nodes but require separate MSILs. An MSIL is the 21CN equivalent of a Central.
All the BT profiling and noise margin mis-management will still apply on both products, though the profile table of course reaches higher - in 1Mbps steps above 8Mbps.
Several ISPs with BT 21CN (WBC and WBNC) connectivity have opted for a single product with a single price. If Sky do that, which is what it looks like, then it would be advertised as up to 20Mbps, but in fact on non-WBC exchanges it would mean an actual maximum of 8Mbps.
So if you or anyone registered on that site wants to copy this stuff in there I don't mind.