(This is the right post; ignore the other one!)
I don't see any way to remove this account.
The actual account I normally use is @dabrahams. Just went through an ordeal to reset the email of that account to my personal email because this account (@Dave_Abrahams1) was sitting on it. Finally figured that out, but I really want this account to go away. Ideally, it would be merged with the other one. Is that something the site admins can help with?