Edit
Sigh. I googled Feigl-Ding and I learned he is not a source to be trusted. I'm not going to share any more tweets by him. I had no idea how questionable he is...
Feigl-Ding has disclosed he is not sub-specialized in infectious diseases and claims to have never misrepresented himself as an infectious disease epidemiologist. [...] His tweets during the [covid] pandemic have also at times been criticized by other scientists as alarmist, misleading, or inaccurate.
Also - for what it's worth - he's a democratic politician. I wonder if his tweets are designed more for his "brand" than anything else.
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