And... I'd ask why you say that, but the answer is clear. You have no clue what you're talking about. About anything really. When the feature is enabled, it's not like somebody tried to re-code it. Github repositories keep a thorough history of changes. You revert the change (the change being, IPS parsing code was deleted), then what do you think happens? All of the ORIGINAL code is back. The extent of "coding" required is literally: git revert 46a4357. From the command line/terminal.
Update your shit. Seriously.