They probably have automated sell of dates or automated sell of prices.
This is part of a consistent pattern over the last year.
He probably hasn’t bought any stocks due to receiving stock as part of his employment contract.
It could be insider trading, but considering how companies have been doing pricing structures and rapid shifts from free to subscription based and then seeing sales/profit increase I imagine it’s worth it for them to simply keep the stock long term, but an initial sell off was put in place at a certain price. Sometimes there’s smoke and there’s fire, and sometimes it’s just simply the fumes of capitalism creating a system that’s uniquely imbalanced for everyone else, but isn’t really insider trading.