From context they mean lossless compression audio format, and standard AIFF and WAV are uncompressed PCM.
On the other hand, AIFF does have a compressed variant ("AIFF-C") spec'd in 1991 [1], which I suspect the author wasn't aware of.
[1] https://www.mmsp.ece.mcgill.ca/Documents/AudioFormats/AIFF/A...
AIFC "compression" is like WAV's codecs / compression type, since AIFF only does linear PCM. I think they're from around the same time.
Re:QOA, the Quite OK Audio Format
by bad_username on Friday February 03, 2023 @02:32AM
(#34638213)
WAV is just a container format that can hold any audio stream, uncompressed (PCM) or compressed.
AIFF and WAV say what?