From my perspective that’s just a rebranding. I dived there years ago and already there it was protected for much longer.
Created in 1996, this [Mar de Las Calmas Marine Reserve] protects the richest marine area of El Hierro, which has a highly diverse and well-preserved underwater fauna and flora.
https://www.hellocanaryislands.com/nature-spaces/el-hierro/mar-de-las-calmas-marine-reserve/
Sounds a bit random but overall not too bad. Sign me up for that!