Of course we can infer but there are a lot (or maybe I'm just now noticing) of comments around "the length is all wrong." and I'm going "What made it right in the first place?" and then I get confused. But, again, ships are not my first love in Star Trek so maybe I'm the wrong person to observe such things.
A lot of starships were designed to be a specific size. We know Richard Taylor and Andrew Probert designed the refit
Enterprise to be exactly 1000 feet (304.8m) long. Andrew Probert later designed the
Enterprise-D to be 2108 feet (642.5m) long (originally 2000 feet long in fact, but Roddenberry made him extend the nacelles backwards a bit). Nilo Rodis, one of the production designers for
Star Trek III: The Search for Spock and co-designer of the
Excelsior, drew a size comparison chart for the movie giving the
Excelsior's length as 1531 feet (466.6m). And Rick Sternbach designed
Voyager to be 344m long, intending for it to be
roughly the same overall size as the original
Enterprise (in fact it has about double the volume because of how comparatively chunky it is).
The problem is that there are many cases where the designer's intended size is not used by the production team. Sometimes this is unintentional – for example, the
Enterprise refit, the
Excelsior, and the various
Enterprise-D filming models were all at different scales, so it was impossible to film any of them together and have them appear accurately sized without having to fudge it in post-production.
And sometimes this is intentional. lnfamously, Ryan Church designed the
Enterprise for
Star Trek (2009) at 366m in length, making it more-or-less in proportion with the
Enterprise refit, and JJ Abrams just doubled it to give it "more presence". Deep Space 9 was designed at around 750m in diameter, but was hugely scaled up to dwarf the
Enterprise-D in "Emissary", even though we can clearly see how big the ops dome, the standard "porthole" windows, and large promenade windows are on the sets, and even though sometimes it has to be shrunk in subsequent effects shots so as not to look completely disproportionate (most notably with the spacesuited technicians working on its hull in the season 4+ title sequence). Let's not go near the
Defiant, which would sometimes change scale (and physical proportions!) between shots, depending on the intent of the production team and the specific model being used. And the
Delta Flyer was designed at 15m in length, yet the interior sets require it to be bigger – too big, in fact, to fit through
Voyager's shuttlebay doors.
And other times it's a combination of the two – while the designers may
intend their designs to be at a specific size they often aren't the people building the physical or CGI models that will be used on screen, and there are cases where that is where changes were introduced without the original designer's knowledge or consent. We know that Sean Hargreaves's
Enterprise-A from
Star Trek Beyond was extensively modified from his original concept by the CGI artists. And John Eaves's original concept for the DIS/SNW
Enterprise was modified by the CGI artists as well, most notably in being given swept back TMP-style nacelle pylons instead of the TOS-style perpendicular ones he originally intended.