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For me it implied Luke had given R2 most of the map in case he needed to be found to rejoin the fight. The flashback of Luke touching R2 for was when he gave him the map, and dropped he missing piece off to MVS.
It implied to me he was ready to rejoin the fight if needed and he wasn't off disappearing, but trying to get a greater weapon to defeat Snoke and Ren.
That doesn't ring true to me either because if his plan was to rejoin the fight at a later point in time, why not tell Leia or Han where he was going? Han's expression made it seem like he had no hope Luke was coming back. Why make some convoluted map? It just doesn't make any sense to me. The map was just an excuse to save Luke for a later movie and to tease fans. But in the narrative, it just didn't make much sense.