The clue is the last line of their comment where they say they have a competitor offering 10Gbps which is why Comcast removed the data cap in their area. AFAIK it's still in place where I'm at because the only other option is CenturyLink 100mbps DSL.

In my area, they removed the data caps last year, when they also rolled out the higher upload speeds (eg the gigabit plan now has 350Mbps upload speed instead of 25Mbps). I don't think they've rolled that out everywhere though.

They also have a habit of keeping people on old plans that are either slower or more expensive. If you're still using Comcast/Xfinity, check their site and see what they offer to new customers at your address. (you may need to use an internet connection other than your Comcast one, otherwise they may detect that you're an existing customer)

Their pricing can differ by region. Not every region got the data caps back when they rolled them out.

It also depends on competition - if there's a lot of competition in your area, Comcast will have better deals compared to if you live somewhere where Comcast is the only option.

I used to live in an apartment that had an exclusivity deal with Comcast (residents were only allowed to use Comcast for internet service). Now I live somewhere in the same county where there's three different fiber providers in addition to Comcast, and their prices here are noticeably cheaper vs the old apartment.