It's been taken out of the pool, . I don't know what you remember being 'fixed' but with how the system is, there isn't really a way to exclude things? It's literally me putting in a range of rarities (say 50-90) and how many items to pull from that range (say 100). When you're doing large batches of like r175 (holiday), some things sneak in. Right now there is like a pool of 10,000 items the free shop is pulling from. Some users have gotten very lucky and gotten some of these weapons before I've been able to get them out (I've gotten most out, I'm double checking the pool now).
It's a godly weapon and Purge and I are very careful about releasing those in specific numbers (if we re-release at all), so we'd rather you didn't keep it. Don't just delete it, though; submit a ticket and we'll deal with it (we'll give you something!).