We took that section off the website. For a while now, we have been experimenting with mathematical models of each spec instead of simulation. The results have been promising, so we are transitioning the whole site to these models. We will provide more details/information in the weeks to come. Right now our main focus is getting every talent implemented and smoothing out any issues that arise.
This change will allow us to create features that we think our users really want, most notably talent picking/optimization help. Simulation is too slow to handle the massive number of possible talent and gear combos in dragonflight.