I remember that post as well I think. Played with it on test when my world was active. The timer on test was 10 minutes(i think?) given the nature of test it was naturally shorter to allow more fiddling with. But the intent was for you to be able to change the colors once a month at the world control beacon. IIRC it took a bit to implement so they could make sure when you changed the colors, it didn’t change the block colors others had already harvested. Thats why sov world blocks have a different ID (I think?)
I think the post you’re looking for is in one of the testing threads when this change was added. Is this it?