They have the same tests, the same fatality rate (4-5%) only the infection rate is different if you think our infection and mortality rates are off by 98% you don't grasp how impossible such a cover-up would be.

US infection and morality rates are liable to be off by some fair percentage but only in a specific way that would raise the actual mortality rate.

Testing supoosedly may have up to a 30% false positive and false negative, on old tests this was true, there are economic incentives to produce false positives so i would put false positives at most around 12% but in deaths false death records are a serious crime and in most cases too big to be risked, I would put falsified death records at maybe 4% that said misreading and clerical incompetence can factor into our data nationally, we have cases of deaths being added to the infection total in some states even though when alive that person was tested and added to the infection data, that is called double dipping and in huge data sets with many contributors it is common. We likely have double dipping on numbers if tests, one guy in a hospital for COVID19 is tested positive a week earlier, is tested again on admission, then when he is reducing in symptoms he is tested every 3 days until he can get negative results for 3 days in a row. That one guy could easily produce 3 positive results which are blindly added to the state data. With about half a million serious cases it's possible we have a couple hundred thousand double dips in the data but that still cant account for Japan's low infection rate.