My vote is for fake. The thumper is exactly like the ones from Lynch's Dune, and I highly doubt the new movie doesn't feature a new design.
I’m going with fake. Partly for reasons stated by others, but also because it’s beyond vague. It’s not flashy enough to capture anyone but fanboys attention, the same fanboys who know exactly what they’re looking at. It does nothing to elicit interest from the general populace not in the know. As cliche as it would’ve been, a sand worm coming up roaring would’ve done the job.