Thanks, but after reviewing the info in your post, it only talks about people that pledged during Kickstarter or Pre-Purchased directly from Paradox.
What about people that Pre-Purchased from Steam?
I believe you still need to "sync" your steam account with pdx, which just lets the forum see you purchased it.
Click on the black paradox tab at the top right to go to your profile. As a steam buyer you dont add a code BUT: you need to sync steam
This image is of the Redeem tab, you want the settings tab I believe;
It might not sync immediately.
You can then;
Check that you entered the correct Pdx badge code.
Log out of this site completely, and then log back in.
Make sure to link your Steam Account with your PDX account too while here.
Also then try to go to the top right, mouse over your name and click "owned items" then sync
Unfortunately it apparently goes slow for some people. Sorry if none of that immediately helped but it may take a few days to filter down to your account.