Yes, it's 29 meters.
...Let me just show you how wrong you are.
Just watched this 3 times. I didn't see anything about the length of a HKW
At the very beginning, if the HWK is 29 meters long, then Jan and Kyle are about 3 meters tall - the scale is all off for 29 meters, but just about right for somewhere between 16 and 20.
Not coincidentally, the people at Lucasarts, who actually designed the HWK, apparently confirmed it as 16.5 meters for FFG, who then used that scale for their model.
Whereas the 29 meters scale is straight from the West End Games books, which have a habit of... well... making up statistics if they're not found within 5 minutes of research.
None of that size quibbling changes what the HWK-290 is, though: a small light freighter.
Yeah, WEG are the same people who gave us the infamous 8 kilometer Executor and not quite as infamous (but it should be) 1.2 kilometer Home One. The latter never even got corrected, despite it being obvious from watching ROTJ that the ship is around three times that size. Unfortunately just plain wrong stats can be found all over Legends, thanks to WEG.