An additional 1,378,843 shares of common stock may be ....An additional 1,378,843 shares of common stock may be issuable to MediPharm to the extent the VWAP of Tilray’s common stock for the five trading days ending on October 9, 2023 declines below $2.3958."
That reads to most people up to 1.378 based on possible trading losses.
Trading losses MEDIF did not want to have should they try to move such a large amount of shares.
Another thing is don't presume they did sell. You don't know. Maybe they did or did not.