I'd agree and support that conclusion...
Just my 0.02
IF the cross-section of this Enterprise primary hull, either along the fore-aft axis, or the port-starboard axis, is similar to that of TOS (with it being concave, slightly thicker at the rim than immediately closer to the center of the P/H), then it would make further sense that we're not seeing something much more 'out of proportion' than the TOS ship.
First off, I don't know that the CGI folks would be that careful -- if this were created only for the teaser/trailers -- to get the relative scale of the construction crew 'accurate'. They're likely to go with 'impression', rather than an accurately scalable welder/electrician/____. Strict accuracy, however, might suggest that this might put in an appearance in the movie, itself.
Second, if you accept that the person (in silhouette, at top in the service crawlway in the expanded screencap) is an average 1.7m - 1.8m male, I'm thinking that, in a crawlspace/machinery area/duct space, the height of that area is going to be such that the construction guy is going to be hunched over a little. An area where there's only an infrequent (at best) need for access, isn't necessarily going to be built for someone to stand straight up – case in point, friends of mine who were in the service ("Snipes" in the Navy, in particular) who were of ‘less than average stature’ who were the ones pressed into duty to get into some of the crawl/conduit/equipment spaces. In IaMD, the service deck, iirc, was sufficiently high for a scene for a stand-up fight between the Gorn and the ISS E crew. And, in the "65 deck" version of the Big "E" in STV, it was behind a brig, and there for a sight gag -- which, to be fair, included James Doohan banging his head.

But, a full-height mechanical area/service crawlway...that seems like a poor use of ship volume that has to presumably be capable of being heated, pressurized, when it is unlikely to be accessed except in an emergency.
The ceiling to deck height for an occupied 'deck' is going to be close to 2.2m - 2.3m. I'm basing on an assumption that, unlike a sub with knee-knocker type hatches, you're going to design to have a little headroom -- perhaps as much as 0.6m (2 feet) -- maybe a little lower -- above the top of the 'taller than average' crewdog's (human or potentially non-Terran) head. I'm just a shade under 1.8m (yeah, I know, long legged gal) in a home with apprx. 2.4m ceilings, and it feels a little claustrophobic at times. By the time that you leave area above hatches/doors for lighting panels and structural elements (the trapezoidal-shaped corridor frames in The Cage and TOS), etc., the extra 0.3m above the "2m stick" isn't grossly unreasonable.
I don't know that we're actually seeing through to the decks (pressurized area). If this is like the overhead shots of the structure, we may be looking at the framing, and some of the 'plumbing area' dead space (so that conduits can be accessed from the interior -- unless you want to assume that they're exposed in the interior as you might see in a contemporary naval vessel only on the bulkheads, and 'hidden' in 'tween decks "Jeffries Tubes”) located between the interior bulkheads and framing and the hull plating. That's making it difficult to judge, precisely, where the overheads and deck surfaces are relative to the upper and lower hull plating.
Best judgment from this civil engineer? Two decks carried through the entire disk of the primary hull. Plus service crawlways between the decks, and immediately adjacent to the upper and lower primary hull plating. And a ‘taller’/deeper crawlway, at the bottom rim of the disk, if the cross-section with the concave hull matches that shown (for instance) in the TOS model and FJD "blueprints".
Maybe, just maybe, a third deck that -- in some areas -- could be a high-bay (two deck) type facility: your basic 23rd Century version of the Ent-D Stellar Cartography lab, or cargo space.