France creates 15min test for Covid-19

I want to be happy for this but it seems very strange there were no false positive results. I guess we'll see in the long run...

Also, the specificity of this test looks 'too simple'. Isn't IgG also seen in other cases, illnesses, post-something?

If there's some medical/biotech expert around, I'd be happy to hear your opinion.

It also seems to say that it will allow detecting whether you already recovered from COVID-19, so everyone back to work ASAP!