Probably because of this weird Midwestern attitude towards salaries.

An engineer earning a $250k+ salary is seen as greedy in these parts. You can witness this from Michiganders right here in this thread. There are a few posts here about how $250k is a ridiculous salary in Michigan and is completely unnecessary.

Ford will likely go bankrupt or be acquired if they fail to stay competitive in autonomous vehicle research. Since there's only a handful of people in the world capable of keeping them relevant, these people are worth literally billions of dollars to Ford and trillions to the Michigan/Ohio/Indiana economies.

Ford should have no problem paying these people millions and advertising that fact.