No one needs to listen to that anymore, especially after 50 years.TOS was implicitly consistent with its writers’ bible in that nobody every tried to introduce something like the Federation-class dreadnought FJ would propose after the fact, not to mention that Kirk’s “only twelve like it in the fleet” would’ve been somewhat deflated if it was just a count with no implied precedence.
I'm sure someone can find contradictions of it with in TOS itself.