If your technique is like the one below (I did not compare with the site you mentioned), try the next one. Let me know if it works!
Load AR2 V2 keeping Resetbutton pressed
- Select Action Replay Codes
- highlight Dave Mirra Freestyle BMX2 Code
- press START
- press EJECT and insert Original-TOC-DVD
- wait 10 Seconds
- now press 'X' on with Codes and 'X' once again
- Error-Message appears: 'Too many Codes'
- original TOC DVD stops spinning (thx, Datel *g*)
- now perform EA Trick (release Reset-Button) & insert DVDR Backup
- press 'X' to confirm Error-Message
- now press Circle twice to enter Mainmenu again
- START GAME, without Codes, press 'X'
- Codes are getting actualised
- DVDR boots
(1) Boot AR2/GS2 disc 1.
(2) At the main screen (picture 1), press the EJECT button to eject the CD tray.
(3) Replace the AR2/GS2 disc with an original PS2 DVD game, such as Dead or Alive 2.
(4) Close the CD tray (press EJECT again) and wait for about 30 seconds.
(5) Select START GAME (picture 2) and then select WITHOUT CODES (picture 3).
(6) Once the AR2/GS2 is asking to change the game disc (picture 4), press the EJECT button till the light changes from
green to orange.
(7) The CD tray will now open and you can replace the DVD game with your backup copy.
(8) The CD tray will automatically close after about 5 seconds.
(9) Wait till the the power LED changes from orange to green again and press X now to start the game.