Got that one as well a bunch of time with 2 fake dutch inventors. Reported it, got denied because Youtube thinks it's fine to promote a scam like that.
If you try to squeeze in as many endpoints as possible, sure.
With a competently designed network, you wouldn't have anywhere near that many in a segment.
I'm on a 300/60 cable connection via my employer, and I have never had my connection test below 360/70. This is in an an area densely populated with apartment buildings, where cable is still the best option for most people, with some fiber rolling out.
I am however moving to a 100/100 fiber connection (plenty fast for my needs, with the faster upload speed), due to a change in employment that is not of my own choice. So I don't consider myself biased in favor of my current employer ;-)
We support up to 1Gbps/100Mbps as a standard subscription on cable, with symmetrical connections available for an additional fee, except on 1Gbit, where the fastest upload available is 500Mbps.
Cable is alive and well, if properly maintained and upgraded.
I'm guessing it's a relatively small network, considering what I know about DOCSIS and how much would have to be upgraded to support uploads like that.
It covers the majority of urban and suburban Denmark, plus a majority of exurbs, anywhere an "antenna association" used to or still exists today and almost every apartment building. They are connected with coax through either us or one of our competitors, and there's mandated open access to coax.
My cable modem is in bridge but I can also reach its web interface the management IP. In that case, you should find out if the modem is vulnerable because an exploited modem could still be messing with your traffic.