This is an attempt to keep pilots from going to Spirit, Frontier, JetBlue, etc. I don't think they're expecting anyone to turn down any of the majors or legacies. They even specifically state who they're targeting with these new rates in their email.....

-------
Including all bonuses, a new hire pilot should expect to make 31% more than pilots at Endeavor and 10% more than pilots at leading ULCCs over the first five years.
-------