You are clearly referring to the 9:45PM Trailways northbound and it's corollary southbound of which there are several operated by Trailways partners. So, yes, it's very findable.WHOOPS! You found the OurBus bus. That's not the one I'm talking about; that one was introduced in the last couple of years, partly in response to frustration with Trailways. OurBus has a published timetable, by the way.
I was talking about the unfindable, "vapour bus" Trailways Bus which runs from Ithaca to Syracuse via Cortland (with no change of bus). Which was around long before OurBus was formed as a company -- but for the last decade or so, has had no published timetable. You didn't find it, which proves my point. It's unfindable even with that search engine. (And it starts south of Ithaca, according to rumor. Where does it start from? Who knows?)
Thanks for proving my point. Apologies will be accepted.