You mix things up and by mixing things up you express incorrectness.
Stay Humble, Stack sats.
Michael Saylor's tweets like this every week mean that his MicroStrategy is going to buy Bitcoin again. He is going to buy Bitcoin again soon this week, adding to his holdings of 601,550.
What he is going to do is to advertise the bitcoins that his company bought last week.
After BlackRock, the only person in a large company who has the largest individual holding of Bitcoin is Michael Saylor. Although Satoshi is considered the largest individual holder in this case, due to his long absence, Michael Saylor is still the top person among those who are publicly present.
What does Saylor as a natural person have to do with Blackrock? Besides the biggest holders on an individual level would be
the Winklevoss brothers followed by Tim Draper.