Dune Part One spends a few minutes talking about who the Spacing Guild is and what the spice means to the Imperium and interstellar travel, etc. at 00:06:40ish. The Herald of the Change arrives, along with members of the Imperial Court, representatives of the Spacing Guild, and a Bene Gesserit. Thufir calculates the cost, et al. You just don't remember.
Again, this discussion is moot since the Baron says there are no satellites over Arrakis. He doesn't say temporarily or for the attack there will be; its a definite statement: "There are no satellites over Arrakis". HOW/WHY is more headcannon speculation on your part but from just the movie, it's not worthwhile to discuss any longer.
They specifically call them out as being there, you remember correctly. They are mentioned a few other times in the movies but DV does indeed minimize their role. For instance, The Great Houses; warships show up at the battle with the Emperor, because the Baron has sent out a call to the Great Houses saying he is under attack by Saudukar legions. What's not mentioned in the movie is the Spacing Guild vastly drops their rates so the Great Houses can bring their armadas and armies to Arrakis to fight Paul and prevent him from destroying the Spice fields.
I appreciate you joining the discussion, Lenardo, but the Baron expressly says there are no satellites above Arrakis at the time stamp in Dune Part One marked above. He doesn't give a reason, though, while we know from the books why, in the movies the reason is not given and since DV changed so much in Part Two, not so much in Part One, one can only hope he tells as a future plot point in the next movie or rather hopefully doesn't, in that I don't see how they redeem themselves after all the changes of Part Two. Just kidding, with the Stupid Pen he can write himself out of anything (just not very well and not back into Dune cannon)!