Actually the rumor is quite true. MicroStrategy would face a margin call if Bitcoin fell below $21,000. What was not true was that a margin call would cause MicroStrategy to collapse. Only 1/4 of Bitcoins are subject to margin call. It owns 3/4 of its Bitcoin outright so it could easily cover any margin calls. https://seekingalpha.com/article/4518457-microstrategy-margin-call-gaslighting-mstr
my ten years on this forum as taught me that reading papers is for losers who can’t trade. You look at the chart and react. Bitcoin is going to 10k.