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The good thing about digital data is that it can be manipulated easily. A few judicious edits here and there, and evidence of anything can be made to disappear. Or appear.
But don't think you need to have technology to enable this sort of stuff. Carry the idea back to lower tech settings. Think what sorts of things you can get up to by a skilful forger having their way with official documents, or royal court records, or business ledgers. If a title deed says that a certain adventurer owns a specific castle, who can say otherwise?
Commentary by memnarch (who has not seen the movie)
Definitely feels like the previous R2-D2 scene was manipulated in its comic position now. It really has the feel of "we [the Irregulars] should explain why R2-D2 just projects a map out of nowhere to make the story better". Especially since it just so happens to have a piece missing that BB-8 displayed before from a chip they've been carrying around. Hmmmm. At least, presumably carrying around. I guess that chip also could have been a map of the Peace Moon and described a weak spot a la Episode IV, but that seems rather unlikely at this point.
Hmmmmmm. So for Nute removing this area of the Galaxy from the map, that would only make sense if he's still got things there on Ahch-To. And if Kylo wants the map so badly, that could mean that Nute never kept a back-up map of the Galaxy after leaving that planet behind. And then realized that Luke might be tracking down the planet and could learn from the remains. The secret to brain uploading perhaps? One of the best ways to fight a malevolent super-AI is to get a benevolent one, and Nute seems unstoppable in the long run at this point without Team Good-Guy having an equivalent. And while Pete would love to have R2-D2 take that role, I bet the GM is going to argue that an organic brain is going to be needed for the procedure to work.
Transcript
GM: Pete, here are details of what you’ve found.
C-3PO: Anything juicy, Artoo?
R2-D2: Yeah, look. Here’s the Galaxy.
R2-D2: There are coordinate errors all over, but they’re mostly negligible, so navigators wouldn’t notice.
R2-D2: Except in this one region, where things go haywire.
BB-8: Is Luke’s map in that area?
R2-D2: Precisely.
C-3PO: So, losing a planet. It was never really sensible, except by manipulating everyone’s maps.
R2-D2: Someone wanted to hide Ahch-To.
BB-8: But Luke found it.
C-3PO: And Kylo Ren wants the map...
BB-8: It’s a riddle, wrapped in a mystery, inside an enigma.
R2-D2, C-3PO, and BB-8: Awesome!