Dead easy
There's the small print.
The tests include antibody tests. So if ignore the RT-PCR tests to see if people have the virus and instead ramp up the testing of anyone to see if they have antibodies, then you hit the target.
Whether that's useful is a separate issue.
And assuming we have the capacity with lab analysers and Roche can supply the tests.
But there is this simple small print in the test target - it covers all kinds of tests. Not just swab tests.