Earlier quoted context omitted.
That's not confusing at all.
What do you mean?
I assume he's being facetious, because it is confusing. Especially imagine someone requesting payment in Ethereum, and you think you've paid, and then they come back and say that you paid with funds on the wrong chain, and to re-send the funds on a different chain. There isn't a client I'm aware of that supports simultaneous operation on multiple chains. It gets very hard to deal with very quickly.