People didn't hear about this because it was in the UK Guardian and the US Business Insider, which MAGA doesn't read.
https://www.theguardian.com/us-news/2021/jan/29/trump-russia-asset-claims-former-kgb-spy-new-book
https://www.theguardian.com/us-news/2021/jan/29/trump-russia-asset-claims-former-kgb-spy-new-book
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It is possible around that time there were more pressing matters on hand - like work and Covid lockdowns.
Nevertheless, I'm still quite surprised I missed it.