I'm not entirely sure how you are expecting this information to look, but the magazine image is only a pic of the cover, which coincidently does state there's a map included.
If you are looking for this in a text format, click on the "Dungeon 118" link at the bottom of the page, it will take you to the page which indicates the insert:
File usage
The following 2 pages use this file:
Dungeon 118Gallery:Dungeon 101-150
This page has some issues and it's possible it isn't complete. Yes, it doesn't specifically call out the deck as an insert.
Keep in mind that these are Wiki pages, which are updated by Acaeum members. They are not actively maintained/supported by an administrator. In addition to that, the Wiki suffered a significant loss of content a few years back, which was never recovered.
I am not taking away from what is being done here, but to click each image to read if there is in insert is a bit much, since this is already being put together why not have a separate post/list stating inserts?
Eventually we will provide additional details under the Dragon and Dungeon magazine indexes, similar to some of the earlier entries. I know that's not going to help you immediately. If you create your own list, or find one somewhere, please feel free to provide it.