https://www.youtube.com/watch?v=LwALe4Z7-p0This 2020 clip seems to confirm the movement is still active.
tl;dr is that Hunminjeongeum Institute basically slapped them with money. They expected it'd lead to more economic cooperation between the city of Bau-Bau and Korea, it didn't work out very well. Still there's a volunteer teacher active in a Cia-Cia village (the man in the interview) and a couple of local teachers who teach Hangulized Cia-Cia and Korean itself.