The concern about fast lanes was mostly about unfair prioritization of traffic over a single link. In this case, Google is offering different links that you can choose to send your traffic over, and they're letting you choose rather than choosing for you. Probably both the standard and premium networks are uncongested on Google's side, although there may be congestion elsewhere in the Internet (that Google can't be blamed for) that slows down standard traffic. The standard path also probably has a higher RTT which may lower TCP throughput.
IMO net neutrality was never about equality of outcomes (there's probably not really any way to equalize performance short of socializing the Internet), but that seems to be a common misconception.
IMO net neutrality was never about equality of outcomes (there's probably not really any way to equalize performance short of socializing the Internet), but that seems to be a common misconception.