I don't believe I've had this exact tea. edit: From the pictures on the site, it doesn't look super wet-stored, and the tea broth is still pretty red and clear. So if that's the same tea you tried, I'm surprised it smelled / tasted so much like shu to you. Can you post some pictures of the tea broth, dry leaves, and wet leaves?
so much that I had to go back to the website to verify that indeed it was under the raw aged sheng section (i.e. not ripened). And it appears so.... though it does not explicitly say it.
7542 (as opposed to 7452, which is shu) is always sheng.
A dry or somewhat humid stored sheng pu'er from the 80s or 90s isn't going to be even close to tasting like shu (and I wouldn't really consider a 90s tea to be "aged"; maybe a 25-50 year old aged pu'er will start to approach shu in some ways). A really clean stored tea from the late 80s / early 90s should probably be like a clear, dark reddish brown in color.
Wet stored sheng has (to me) a somewhat different flavor profile to (non wet-stored) shu. If the sheng is mildly wet stored, there will usually be more aggressive and woody notes coming through the storage taste, and if it's very wet stored, that sharp wet-stored taste will be almost the only thing you can taste, and the soup will be very dark and thick with an oily sheen on the top.
I agree with Tom Verlain's point about durability, at least based on my experience. Shu will usually drop off pretty sharply at some point. And yes, you'll definitely see some difference in the leaves -- wet storage will make the leaves break apart a little more than dry stored sheng, but not usually to the degree of shu.
Wet storage means different things to different people. I'm not trying to bring up the religious issue of what type of storage is ideal, or how "wet" is too wet. But I do think that no matter what your preference, it's a good idea to try and find some credible examples of different teas with different degrees of compression aged in different climates and see what tastes good to you and makes your body feel good. Personally, I've had some teas that other people thought were too wet-stored that I liked quite a bit. On the other hand, I've had some teas that (to me) are overly one-dimensional or have too strong a wet-storage taste to be really interesting (though some of those are still smooth and pleasant enough to drink).