This was addressed recently. I’m not a huge fan of the concept. The Luna class isn’t a favorite of mine but the Titan deserves better than this.
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They’re basically saying because the Constitution III class Titan-A uses parts from the Luna class Titan, it’s a refit.
Really feels like stretching logic to put a round peg in a square hole. That’s not what a refit is in established Trek lore and they’ve misused the word twice now. This was all further complicated by the Connie III looking so similar to the Shangri-La class and people being made to feel the Titan-A is some kind of refit of that despite the massive scale differences. Blass just refuted only yesterday.
It’s all just so unnecessarily convoluted and weird. And I hate when they just scale up an existing design and illogically make it bigger like the Xyston from Star Wars TROS.
Matalas just really wanted his classic looking ship in the show and he’s said as much. But honestly I think the Excelsior II class would’ve been the better choice which does a far better job bringing a classic design into this era.
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And it has been hinted multiple times an Enterprise will make an appearance, other than the F that is. You might get your wish.