Seems more likely that its an artifact of being the guy's second language.

Pluralizing code always sounded weird to me, but I think it was more common in certain regions and timeframes.

Code as a verb seems pretty common though.

That's an English-as-a-foreign-language thing. Particularly from Asia.

One of my favourite pieces of trivia is that the "nuclear codes" that were so often the subject of some Cold War plot were not necessarily codes as in launch codes, but were/are simulation programs, which were, in aggregate, "codes" (though I'm not 100% clear if a single simulation is a single "code"). Which makes a lot more sense, because simulations would help development, and launch codes would be useless almost immediately as they would change [1].

The IAEA still calls them "codes": https://nucleus.iaea.org/sites/oncore/SitePages/Home.aspx

[1] unlike the Permissive Action Link code locks on some weapons, which were deliberately set to all zeroes for decades.

+1000%