No, Walk Through Walls hasn't been updated since SW/SH launch almost 2 years ago. The code will likely never be updated, so you're best forgetting about it TBH. As the game ages and gets more updates, less cheat makers focus on the game meaning updating cheats every update is less likely to happen, so we take what we can get.
While I'd still appreciate this there is a bit of a workaround:
1. Use the x1 cheats to get 1 of every item
2. activate get x999 on item pickup
3. Deactivate the x1 item codes
4. Hand each item to a pokemon and take it back
5. Repeat for every item....