This isn't the case; they are sold by Aeotec now, as is all former SmartThings hardware: https://aeotec.com/products/aeotec-water-leak-sensor
So, if you like that one otherwise, go for it. 
I'm not sure which topic you were reading before, but it could have been an older one from a few years ago, the last time a community poll was made. Here's one with recent nominations, though no "official" results yet (and really not as much activity as the other topics for other categories of products, perhaps because this is a bit more boring and not something you use every day like a motion sensor):
My recommendation would be the CentraLite leak sensor, which you can buy from Ezlo (who owns them now), Amazon, or a variety of other resellers: Water Sensor and Water Leak Detector | Water Leak Sensor. You can sometimes find them on sale for cheap. I'd really recommend any of the CentraLite products if you like Zibgbe--most are reasonably priced and work well. They're the OEM behind the Iris v2 community favorites that were discontinued years ago but still pop up in poularity contets like the above because people like them so much...not sure why these don't get the same love. 
