Additionally, the loops in this particular pack were made using real 90's hardware - so those do technically contain the PCM samples from those synths, but what makes this different is that these are performances rather than "rips." The melodic loops are quite literally just me playing the instrument - the original hardware. As it is my performance, the legal license belongs to me and I'm free to sell or license it as I please, hence this sample pack!
So you can use these loops in your own music, but if for some reason you attempted to extract the PCM from the loop, that would technically be infringement, and against the pack's EULA.