If we are literally converting the new to old, wouldn't this theoretically remove the need for SecuROM?
The impression I got was that SecoROM was not tied to the game itself, but to the launcher. You can't load the game without the launcher, and you can't use the launcher without activating the game. Similar to The Sims 3; by default, you can't play the game without the launcher, and you can't use the launcher without the disc being in the drive.
Since this patch replaces the new launcher with the original launcher, one that does not require an internet connection or any activation whatsoever, couldn't this theoretically bypass the (completely unnecessary and appalling) DRM? If I remember correctly, you are not asked for your activation code until after the game has already installed.
Even if this is the case, I can't see this as being much of an issue. The SecuROM is namely there not for the game itself, but for the features provided exclusively by the new launcher (DirectX, Cloud Saves, Achievements, etc), features that are disabled when converting to the old version.