Random German state (Bavaria) for example [0]: Cause of death known for 98% of all COVID-19 deaths, 87% of these died from the disease, 13% from other causes. I just don't really see how it's misattribution when that data is available (which I assume it would be in any country not completely overwhelmed by the pandemic).
[0] https://www.lgl.bayern.de/gesundheit/infektionsschutz/infekt...
It's just a matter of timeliness in some cases and up to the consumer of such data to decide which is suitable for which analysis (and honestly a moot point, no country tests enough to warrant the assumption that the odd accidental death that is later corrected would be worse than the effects of undercounting).
[0] https://www.ons.gov.uk/aboutus/transparencyandgovernance/fre...
Dude is also a known antivax: https://www.vice.com/en/article/qjpxwx/how-france-became-the...
Not too surprising when you see where he works ;-).