No such thing as triennial service.
There was a tradition mentioned in the Yerushalmi that some communities in E”Y would read the Torah in its complete cycle once every three years, not once every year. The early Reform movement adopted this, and the Conservative movement did in the 60s and 70s, when they started to reject halakha wholesale.
To my knowledge, many Conservative synagogues will still go through the entire sedrah in the course of a week; they just break it up differently (so that a little is being done at Shabbat Shacharit, a little at Mincha, and a little on Monday and Thursday). However, considering everything else they do against halakha, recording a service and doing havdalah in the morning doesn’t surprise me one bit.