They also assert that Bluesky doesn’t federate (it currently doesn’t, but the protocol is designed for federation!) when it’s clear that it now does.
I’m not surprised about the skepticism there though. These are just promises, and we all know that a for-profit entity will happily sacrifice any promies if it means they make more money that way. Also depending on how exactly that federation will work it might be practically useless as well.
Anything that can compute can do it. The important part is that it has an associated non-insignificant cost.