Those (vendor purchasable) Epic Rogue Hirelings are also available for purchases using Platinum pieces at the appropriate Hireling vendor as previously stated.
Ted, I mentioned [Dispel Magic] scrolls (UMD Difficulty: 28) with regards to an 'alternative method' (if someone really was bothered enough) to dissipate the Spell Wards without having a [Rogue] in the party. Even my pure Barbarian can easily use Dispel Magic scrolls because I invested some points in the UMD skill for her.
For example, it means my Level 20 pure Barbarian could easily "disable" the highest (Epic Elite) CR:36 rated Spell Ward in the game – on average (5 successful castings). In contrast my Rogue would have to heavily invest in equipment and training if she were to use Disable Device for a Spell Ward; the [CR:36] Spell Ward would likely have a Disable device DC near 116. A Disable Device skill of 116 isn't as easily to attain as getting enough UMD for using a simple Dispel Magic scroll. I can tell you this, at Level 20; my well-geared Rogue likely wouldn't be able to reach a Disable Device skill of 116...
I'll reiterate; the Epic Hirelings are possibly not intended for soloing Epic Elite within Bravery Bonus on their own nor should they be. The Epic Rogue hireling Disable Device skills will likely be aimed for being reliable for Epic: Normal or Hard settings.
The Rogue Hirelings still flat-out cheat; they don't even need to have adequate search DC for "unrevealed" trap Control panels to be able to attempt to Disable them.
Thus, the hire's Search skill is effectively unlimited; they'll never fail to locate a Trap Control Panel, whereas my Rogue would need a Search DC of about 100 for Level 32 on Epic Elite.
The problem you seem to be having is you are expecting far too much from the Rogue hire, they aren't really meant for doing Epic Elite at Level. Elite is intended for full, well-prepared, well-balanced groups of 6. Maybe SSG should use better wording in their descriptions, and mention those rogues were designed for cakewalking traps in Epic Normal content.
Perhaps you should take it up with SSG and ask them directly why those Rogue hirelings were purposely designed for helping with Epic: Normal or Hard, rather than Epic Elite. I can make an educated guess as to why they chose to aim their Disable skill for Epic: Normal, and possibly Hard, setting environments. It actually makes a lot of sense – even if you don't agree with their decision.