It sounds as if the 1st problem is the crappy Chinese tests, a second is that it is unknown how long immunity lasts, and I’m guessing the 3rd is that mild or asymptomatic cases may not develop full immunity (sort of like a flu vaccine that is “off” / targeted the wrong strain.) For example, what if a healthy person gets infected by a moderate viral load, recovers from mild illness, and then gets a heavy dose of the virus 3 months later? Are they reinfected and mildly ill / carriers again?
My biggest concern is the second problem - immunity.