I've run into the same issue in another playthrough. However, the perk doesn't have the original Form ID because the Load Order of my Mods are different this time around; Instead of "10007b65" the Form ID is "0C007B65".
After hours of trying to find a way to generate perk Form IDs with the console "~" (and failing), I
I found "FNV Edit"
. I'm not a pro modder and don't have many mods. I mainly just use TTW plus maybe 4-6 other mods and so I've never used this tool before now but it lets you see the Form ID of Perks and any other item or effect in the game.
This is how I did it.
Download it, extract it, Double click "FNVEdit.exe".
Dismiss the popups and make sure all boxes are checked in the "Module Selection" Window, then click "OK".
Wait for it to do it's thing.... Once that's done, look at the LEFT panel where all the mods and DLC are listed. Find "TaleOfTwoWastelands" and click the + to the left to expand this section. Scroll down to "P" section to find "Perk" and click the + to expand this section. Now Scroll Down to find "l337 H@cK3r" on the right in this list which is accompanied by it's Form ID on the left.
Open FNV-TTW, Load game, Open Console (~), "player.removeperk FormIDfromFNVEditStepsAbove".
Hope this helps anyone else having the same issue.