pull down to refresh

The Twitter X might contain a backslash character?
One of the dots in the middle of the QR is cut off by one last hard-to-see underscore
reply
Ahh
reply
Reading those from top to bottom and adding them to the address (URL) gives
Clicking on the treasure box downloads a Keepass database file.
The text hints at secrets from the first three free lessons.
The secret from lesson one is abstract (see comment in this post).
reply
So it looks like your original guess about needing to do the lessons was right then.
reply
Oh wait, a DIFFERENT puzzle. This is deep.
reply
It would have made sense to me if the passphrase for the .kdbx would have been froogsliKetoowearpink##1 from the lessons, but that isn't it.