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>The current version of Mac OS is Mac OS X (pronounced "Mac O-S ten").

https://support.apple.com/kb/TA22541?locale=en_US

I think he meant that it was not supposed to be "Mac Oh Es Ten Ten Nine Two", but rather "Mac Oh Es Ten Nine Two" when referring to Mac OS X 10.9.2. Do you think people said "Mac Oh Es Nine Nine One", or "Mac Oh Es Nine One" for Mac OS 9.1?

I think you write (and say as /ten/) "X" as the major version if you're also using the non-numeric minor version: "Mac OS X Snow Leopard"; but you omit it when using the numeric minor version so as to also use the Arabic major version: "Mac OS 10.6". You say /ten/ either way and never twice.

People seem to quite commonly write "Mac OS X 10.6", which duplicates the 10. News articles and Wikipedia included. I don't remember what the machines themselves reported, though. I don't have anything pre-Sierra anymore.

I'm pretty sure it was meant to be OS 10 the whole time. It succeeded OS 9.

I've heard employees try to avoid using the dot notation when they speak in favor of just saying the codename.