Both of you are right.
Brand-X uses an RX20 (rotary extraction) (a lot heavier than a buffer and are awkward to use in comparison)
After the extraction, using pads seldom if ever, dry the carpet like the low moisture only process does.
They can do a dual process and are supposed to, but rarely do because of the additional time involved. Not only in cleaning but also the time involved with two sets of equipment- in & out of the van. (not very productive for the $ return)
More than likely it was wicking.