Well sure, and that is a perfectly valid comment at the micro level. However, we can relatively clearly see that the COVID-linked death reporting is under-reported from mortality baselines.
Therefore it's highly likely that for a given death it is more likely to be incorrectly categorise as non-COVID when COVID was responsible, than to be incorrectly designated COVID.
It overcounted some of the test based deaths, but in terms of excess mortality there were probably still more covid deaths than have been reflected in test-positive death numbers, so it’s still an undercount.