No need to delete it. Whichever one you merged/set last will override the setting for the MenuShowDelay
DWORD data value.
DWORD can have it's data modified to whatever you want the time delay to be. The one in the tutorial on the first page has it set to 0
(zero), and the one in your post has it set to 20
. It's up to you for what you would like to change it to be. That's all.