I'm the author of the post, if anyone has any questions (or corrections :-)
)
:)
I agree -- I dislike when important technical concepts are redefined for marketing purposes. It's a bit like lightweight marital fidelity, where your spouse is faithful to you in specific circumstances.
While your analysis of Cassandra's Paxos implementation may be correct (I haven't checked), I've never heard of anyone else (especially not Google) using a model where there is only one Paxos server per datacenter -- usually there are many more.