SpaceX will absolutely shoot for the 2028 mars window to put a starship on the surface there, and consequently deploy some robots etc. to test operations. I think the process to get there is achievable/likely, as it really just depends on building a path to a refueling operation with the next iteration of developmental test articles, and then sending what amounts to a fancy/large probe to land on what would presumably be one of the most safe landing sites. The lunar lander will help with that, imho, as the dusty/low atmosphere of mars will benefit from control tests.
Note the Martian launch window closes before any next POTUS would be sworn in, in early 2029, so the Dems really won't be able to stop SpaceX in this time period.
Artemis III landing on the moon is dependent on actually happening,
according to Nasa, in 'mid-2027.' Now, does anyone take that seriously, even with interim administrator saying it will? I certainly don't, and would cite the long, incredible history of timeline failures by the entirety of Artemis and the predecessor programs dating back to the space shuttle.