The quoted post is quite clear. You cannot create a give away thread on the forum and request users to show reports or drop addresses for rewards. Read on this quotes to understand further
Seems like your giveaway incentivizes posting within one or more specific threads ("answer with their federation or wallet address") in exchange for altcoins ("a asset on the stellar chain"). So no, it's not allowed. You're free to post an announcement for your giveaway in Bounties (Altcoins) but accept entries via Bitcointalk PM (either ask users to PM you or PM a user specifically created for the airdrop). You can also accept entries off-site (e.g. via Google Forms).