How many times do we need to fight the same battle? Where I live Netflix has a fast lane and from 6:30pm to 10:30pm every night my internet is unusable.
Netflix does offer to give servers to ISPs to put in their datacenters. So if your ISP is seeing congestion on the IX links, it is entirely possible that Netflix still works fine (because the traffic doesn’t leave the ISP and is therefore not hitting the congestion). But that is not a “fast lane”
Other companies embed servers with ISPs as well.
netflix users are going to complain and change providers if their tv show buffers at all, so it makes sense to prioritize that traffic - not for netflix's benefit but to avoid angry customers