I believe the Tigers know there is 0% chance their FA offer to Skubal will even be remotely competitive to offers from the Mets, Dodgers, Phillies, Yankees, Rangers, Giants, etc.
They know Skubal will not sign with the Tigers because he wants to win and the Tigers aren't going to spend for top tier FA's like the other teams I mentioned. Their payroll is so much lower than the other teams and that affects the players that the team can put around him.
For the Tigers or any team with a low payroll to compete, things have to fall in place perfectly for them. And the last 2 years have been best case scenario for the Tigers. Look at this off season: the Tigers have done basically nothing to improve.