I won’t miss the “oldest friend” joke at all, and on top of everything already mentioned, even if Babu knew they were going to Endor, I just can’t see his character sending a message to the horse people about Rey, the last hope, coming to their planet. It’s as if Watto sent a message to the Gungans to expect Padme.
It wasn’t sent directly to them, it was sent to that general location on Endor for anyone to pick up. Jannah clearly has no idea who Babu Frik is based on her tone of voice. Granted, that could possibly makes things worse and not better since there could definitely be some fanatics in the area. Babu was definitely taking a gamble there.
EDIT: Just had an amusing thought. Since we made it the forest moon in this edit, perhaps he thought a bunch of Ewoks would come to their rescue lol. Then again, they can’t pick up transmissions, so rip. At least they would likely recognize 3PO.