Afaik they still have it, but it isn't used to blast propaganda anymore (just play music for tourists). I haven't found any more recent news articles saying it was removed or taken down, and wikipedia doesn't mention its removal.
It literally says in the first article you posted:
> until it was taken off duty in the 1970s
Followed later by:
> Kinmen stopped using the speakers for such things sometime in the 1970s, opting instead to occasionally play the songs of the Taiwanese pop star Teresa Teng, at moderate volume, for the benefit of tourists.
Taiwan ended martial law in 1987, it's been a democracy ever since. They don't spread propaganda, they are too busy worrying about themselves and trying to ensure they have a good image to distance themselves from china.
Ah I was confused because your suggestion of "Taiwain had" implies that they no longer have it, whereas they do have it but no longer use it. So technically this should be the sentence:
> Also, Taiwan has a huge speaker array pointed at mainland china which [used to blast] propaganda
Had.