It says that you have the role on discord and a role is not required to access the BST forum here on the website. Since you had the BST role on discord before the new MarketPlace rules you could have posted your sale without making a Forums account.
But since you are here, Welcome...
Hasbro Pulse has updated the Pulse Con 2021 page to offer details on what we can expect from the event.
We will also be hosting a voice chat during the event on our Transformers discord server: discord.gg/allspark