That's kinda what they are underneath, but things are never that simple.

For example, getting all that power across a single "cable" (or bundle of cables, or connector of some kind) introduces interesting engineering issues. Heat is a big problem, and watercooled cables are more and more common even in regular EVs. The article also talks about how conductive dust can be a massive issue and how they need to work around that.

But why bother bundling the parallel cables? It's probably faster / easier to hook up six separate flexible cables than a single bundle that's incredibly stiff and heavy.

I'm assuming since even 250kw EV chargers require liquid cooling and are already difficult to work with (limited length, extremely stiff and a lot of hardware to safely connect), that it becomes a bit cumbersome to work with 8 of those cables.

And even if you are reusing the same connectors and cables, I'm assuming it would need some kind of orchestration to have all the chargers work in unison. And at that point designing a single connector sounds like a logical next step. Especially if they are going to design it to work in the harsh environments they expect.

But I'm also just a layperson, so I absolutely don't know for sure.

Higher voltages and liquid cooled cables permit higher power levels without making the cables and connectors unreasonably large and heavy. You can see this in Tesla's "V3" supercharger, where they increased the power to 250 kW, but actually made the cables thinner by adding liquid cooling.

Of course, high voltages do brings other issues, like risk of arcing, that need to be mitigated.