They also are testing anyone who wants a test for free. And if someone tests positive, they are using cell phone location records to contact everyone you may have been near while you were infected to come in and get a free test.
Digging into it, they also had an incredible testing network, which is claimed to be a key differentiator. In the US, the government is actively telling people not to get tested on their own judgements.
I too would prefer much better visibility over a shelter in place order. Unfortunately, we have next to no visibility. So lacking that, I would prefer dramatic measures.