Close, but no.
https://www.hoopsworld.com/utah-jazz-team-salary
15 million vs 8.6 million, that could be an extra player salary picked up in FA. They want Jefferson.
The only proposed trades I have seen in this thread are made such that Millsap or Jefferson can interchangeable. Just because they have a bigger expiring doesn't mean they get more cap room next year, it just means they spend more money this year.