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Technically? No. We haven't really seen much from that time period. However, the Connie is officially classed as a heavy cruiser. In the real world, the only things that displace more than a cruiser are battleships and carriers, neither of which describes the Crossfield-class. Additionally, the other known heavy cruiser is the Ambassador-class, which is newer and larger than the Connie, and there's a general trend of Federation ships getting bigger with each passing era; each new Enterprise is larger than the last. Lastly, of the few known Starfleet ships from that time period before DSC was released, the Constitution-class was easily the biggest.I assume the idea that they're huge is based on the idea that the connie was one of the more powerful vessels of the era? Is there any canon evidence for this assumption, other than the comment about the Excelsior being a 'big ship'?
The Crossfield-class is officially a science vessel. The largest of those we know of that isn't the Crossfield-class is the Miranda-class, which is smaller than the Connie. The others are the minuscule Oberth and Nova classes so the Crossfield is an outlier in its categorization. Even the TNG-era Romulan science vessel is on the small side. The spore drive could partially account for why the Crossfield-class is so huge since we don't know that much about it (it does seem to require a small forest), but even then no Federation ship from any time period matches it for sheer length, being even longer than the Sovereign-class. We also know that the Sovereign and Galaxy classes are the biggest things in the fleet during the TNG era thanks to the large number of ships we see through TNG, DS9, and First Contact. Overall, I'd say the Crossfield-class seems like an outlier given what we know of established ships.
It's harder to get a handle on the Walker-class. All we really know about it is that it's closer in age to the NX-class than anything else. For all we know, the Shenzhou may have first been deployed during the Earth-Romulan War. The Walker-class may have been a battleship or even dreadnought when it was in production, which, in combination with miniaturization of technology over the decades, could help explain the size relative to TOS and TMP ships. However, when we see the Federation fleet in the premier, the Shenzhou looks to be an average size. This would seem to indicate that the Constitution-class is a rather small ship, which is odd for something called a heavy cruiser. This also creates an oddity where the Excelsior-class isn't actually large for the time at all, and is actually rather lean, making the comment about how big it is rather incongruous.
Ultimately, while these numbers are official, we're also getting them secondhand from Eaglemoss rather than directly from CBS or anyone involved in the show, which is unique. I'd say there are three possibilities. 1) They're right and everything we thought we knew about starship sizes is wrong. 2) The numbers are wrong and someone will release accurate ones later. 3) The numbers are right and they're going to retcon previously established starship sizes, likely including scaling the Constitution-class up to how big it is in the JJ-verse movies.