I've been a long long time Verizon Wireless customer. T-Mobile was my first carrier back in the days when Catherine Zeta-Jones was doing the T-Mobile commercials. Switched to Verizon shortly after then. Anyway, I remember some of my coworkers who held onto their "truly" unlimited plans - I always kept up to date with the latest plans Verizon offered and was able to compare my speeds with theirs - they had abysmal speeds while I always had super fast speeds. Sure I paid slightly more but ... I got 3-4x more throughput on my phone than they did. (It convinced them to upgrade too because Verizon slowed them after 5GB).
View attachment 1931574
When iPhone's 5G phones came out, I got a notice from Verizon saying I needed to upgrade my plan to take advantage of 5G - and if I did I'd have "premium network access" - if I didn't, I wouldn't have priority access - I didn't take a screenshot of the notice but above is what it says now. Annoying but nothing new for Verizon (they've been doing this since the Droid 1 days).
Wish I had saved that notice. But yeah, that site you listed is accurate imo.