My guess is he probably was talking about single phase.

But 2 phase power was common, and is still occasionally found, in two
places I know of- Buffalo New York, and Philadelphia Penn. Since both
of these places were wired very early in the history of
electrification, and they were industrial centers in the 19th century,
they got pretty far in using 2 phase before the single phase/ three
phase system was settled upon as a standard.
As a result, you still find the occasional used machine tool in PA or
NY that has a 2 phase motor on it, and there are still shops wired
that way there.