To clarify, that "$150/month" figure appears to be taking the cost for a basic DirecTV package and adding it to the cost for the NFL Sunday Ticket add-on (DirecTV charged the same $300/season as Google is going to be charging, although in practice, DirecTV usually split the cost across six months' worth of bills).
The difference is that Google will make NFL Sunday Ticket available on a standalone basis, but if you're also paying for YouTube TV (or any similar cable/satellite/streaming service), the total cost would end up being close to that "$150/month" figure anyway.
(Also, in practice, DirecTV would use NFL Sunday Ticket as a "loss leader," giving it free or at a discount to new customers and even some of their existing customers -- as an existing customer, I got it free in both 2021 and 2022 without even asking, with a midlevel package and the MLB Extra Innings package as my only premium add-on.)