This page isn't accurate to their new upgraded infrastructure (mid-splits, DOCSIS 4.0) they've gradually been rolling out over the last year or so. Currently only available in certain areas and limited to their rented xFi modems, but it increases speeds to something like 50 down/50 up, 100~900 down/100 up, 1200~2000 down/200 up.
I don’t trust Comcast and coaxial technology to actually deliver close to that if multiple people in the neighborhood are using. As far as I understand, Comcast splits a small amount of bandwidth between a ton of homes, and then applies QoS based on how much people pay. If you buy the 200Mbps up tier, then you might get 200Mbps up for a little bit as a “burst” speed while they take away from the rest of the neighborhood, but not continuous.
If it was comparable to fiber, then they would advertising the upload prominently like fiber ISPs advertise it.
Theoretically, yes. Practically, the fact that no coaxial cable internet prominently advertises upload bandwidth leads me to believe there is far less upload bandwidth available than fiber networks.
Edit: You can see these new speeds listed here: https://www.reddit.com/r/Comcast_Xfinity/wiki/knowledgebase/...