You've omitted the next sentence which answers your question:
It only really holds for data that you know is sensible values vs. time.
And a time-domain sampled signal is exactly that. As, by the way, two sentences later also already tell you:
So, yes. If you are capturing Complex data, it will be a series of real and imaginary parts in order that could be easily expressed as being in the time domain.
also:
can I process data with fft(data)
we already established you can, in other questions of yours. You do need to read back the data in its original format. Which complex numbers composed of interleaved 32 bit floats in your machine-native format.