It means the market doesn't think it's likely but it doesn't mean it's 75%. To illustrate why that makes no sense, if Musk had offered $35 instead of $54, the buyout would be much less likely, since the price would be way lower and the board and shareholders less likely to accept it, yet under your model the likelihood would go up.

Estimating probability from price action is something you can do, but not like you did it.