I figured it’d be obvious from the context, but this is supposed to be a(nother) clue that Nathan doesn’t really understand what he’s talking about (yet). He’s basing his entire lecture on a single caffeine binge and half-remembered knowledge from from a decade ago, and so this simply slipped through.
The MC doesn’t spot it and can’t call it out, because at this point in the story, they haven’t cared enough (yet) to actually research what this convenient cover story is about (it’s not the only point in the story where you realize they’re a bit lazy).
The only person in the room who would know is Sarah, and she’s far too shy to bring it up, especially after Ethan derailed everything. (And afterwards, she and MC have… more urgent topics to discuss.)
The only time Nathan could bring up his mistake would be during the ending sequence, and there everyone involved again has more urgent issues to deal with.
If I ever get around to add more casual scenes between the various characters, this could be brought up, but with how far behind I already am with the already promised content… no promises.