If this concept would work in principle, covid could be reduced to scaling testing capacity. My impression is that estimates about achievable testing capacity don't assume a most-important-short-term-problem-of-mankind priority and resource allocation.

The linked article suggests a novel and much cheaper test, which would be great. But even if that didn't work out, what scale could possibly be feasible with existing tests? Pre-shortage, an RT-PCR seemed to be much cheaper than a missed day of work.