They're dried, like what you see for dried flower arrangements. Used for dry tanks like vivariums (frogs, etc.) and for aquariums like ours. They're attractive decor, and shrimp love them: lotus pods provide shelter and food (imagine a hotel where all your friends live and you can eat it too). They take a few days to sink, even if soaked overnight before adding to the tank. But the shrimp don't mind.
They must be bought from someone who's specifically selling for a tank with living creatures, as you'll find plenty for dried arrangements that have essential oils or are old and dusty.
BTW, your seller has a listing for that floating bamboo. And everything else in their shop looks pretty special. If you don't see anything there that shows flowering plants, ask them. This person seems knowledgable. If all else fails, search online for"aquarium flowering plants live", hit "images", and you'll find sources. Most sellers give a description of how long before they flower, growth rate, etc.