Good catch -- and very important. See below.
I don't know what to say about this -- or how you could determine what it means or even how accurate it is. Often advertisements for these things suffer from various kinds of errors. If you can communicate with the seller, you might press them for details. Otherwise, my Wessex horn has been great for me.
People have done it. Not so much nowadays since similar deals (or "close enough") can often be had through sources about which you have more information and in which you have more confidence. I don't think that I'd order directly from some source in China.
The Besson models on which these are based are well known. In fact, they are often mentioned in advertisements. Take a look at the Besson site's
Besson 982 Sovereign Eb Tuba page.
The lead pipe is a significant issue -- and which one you want depends mostly on how tall you are. If you get the one with the low leadpipe and you're tall, then you'll always be scrunching down to it (which will be -- literally -- painful). Or else you'll need to use some kind of stand or support. On the other hand, if you get the high one and you're not tall, the you'll have trouble being comfortable always reaching up to it. I'm 6'2" (or somewhat shorter now from old age shrinkage) and so I was careful to get the Wessex that has the higher leadpipe.
On the other hand, I STRONGLY recommend the use of a tuba stand (to just about anyone). I made my own "sit on" tuba stand, but various commercial stands are available. Or you can just try a cushion in your lap. But you'll probably need something. Almost everyone does, no matter what the tuba or their height. Holding and playing one of the Eb Besson-clone compensating tubas takes a bit of getting used to. You'll have to get used to the angle at which you hold it, and get the height adjusted to your own requirement. On the other hand, I have to say that I LOVE my Wessex Champion. Superb intonation, it's "set it and forget it" in terms of tuning and slide position, and it really pitches the (classic British tuba) sound. You can see in my signature the mouthpieces I use on it. It will NOT (in my opinion) as a single tuba fully support a decently sized (e.g. 45+ piece) concert band. But it's a kick to try. And otherwise it's just a lot of fun since it really covers the high range above the staff and can handle the contrabass range below the staff (though not like a big BBb can). Also wonderful in smaller ensembles like quintets. For many years I played a Cerveny 781 full size BBb classic Czech/German horn and loved it. It ain't one of those. But I gave it up for the 981 clone (high pipe) Wessex clone because I just have more fun with the big Eb.
Re Laabs. I've never had a problem with them. This includes my bass trombone and (within the past week) getting some extra parts from them to do a kind of goofy mod I want to try. But others have had different experiences.
Oh, one other thing -- especially with an eye towards "doubling": If you go in the Wessex direction, you might think about getting one of the models with the smaller bell -- or a slightly different smaller Eb mode. That big 19" bell is a bit hard to horse around, and a model with a smaller bell might provide a bit more utility to you. My only regret about my Champion is the big bell. I know what it brings, but over time I think it would have been better to have one of the smaller bell models. Just something to think about. It may depend to some degree on whether you see yourself mostly playing in large (band, orchestra) ensembles or smaller (quintet, brass choir, etc.) ensembles.