Currently it doesn't seem to hide the menu simulations as stated.

What menu simulation did you see that was meant to be hidden?

All of them, as far as I can tell? I'll grab a screen shot of some of the space age content that it shows.

It seems to show less than it did before for some reason. I was seeing the new planets previously, but now I'm only seeing Nauvis / Space travel. But it still shows new buildings + the space platforms. I assumed these were also meant to be hidden? Maybe I changed a setting somewhere.

Sorry, but I don't see where to add attachments if I even can.

edit: I'm not sure how the simulations are selected, so maybe I need to wait a while to see a different planet

Fails to hide a menu simulation in space. I believe it's menu-simulation-platform-moving. I've been trying to avoid spoilers beyond the things I've seen in the FFFs. Had to give those up on reading those at some point, but the person I was playing with was totally unaware of what space looked like until that menu simulation popped. Unfortunate spoiler for them, but at least this mod mostly works!

Will probably just manually remove the data files so no more accidents happen.

Sorry for the inadvertent spoilers. The latest release fixes 3 menu simulations that were not hidden properly. 2 platform simulations that are now correctly hidden behind "Space", and a Nauvis simulation showing endgame buildings that is now hidden behind Aquilo.