First thing I noticed as well. Very little angle there ; looks close to a 10 degree milling chain compared to a normal chain in the 30 degree range.
cut about 25 ft of that wood from New Zeland that is full of silica and that is about what a chain will look like. Rounds off carbide tips also and makes round humps on a steel plate saw blade. If You want a wood deck that is impervious to just about everything that is the goto stuff.
I don't want a deck that tough. When customers ask me to work in IPE the price going screaming through the roof. Chopsaw blades last very very little time.