This vessel is much more a large Type 022 attack craft. It's clearly designed principally for anti-surface warfare and would be used in groups of 2-4 relatively close (100-200 km) to the Island against large concentrations of enemy ships.
It is interesting that they designed a ship 500 tons in displacement and with such great endurance. If they only wanted an FAC missiler against china they could have built something more in the he size of 022 which would have suited their needs well, and they might have been able to build more of them as well.
That makes me think they either desperately wanted to get the HF-3 missiles on an FAC and anything smaller than 500 tons couldn't carry the bulky munition, and/or they want a large FAC that can be used against beyond the Taiwan strait, and very possibly against other navies, not just PLAN.