Yes, those are flower stalks.
I do wish members would read the profiles:smash: as things like this are usually mentioned.;-) The Vall profiles explain the male plant and female plant that both have distinct flowers.
Except for ferns and mosses, most (perhaps all) the plants we keep in our tanks do naturally flower. We may rarely if ever see this, due to various factors involving emersed/submersed, parameters, nutrients, light and temperature. Often the only hint of flowers will be those that may be on the plant when we buy it.
Byron.