Lost old account

Hello,
I wanted to sign up for sythe but I couldn't because I already have some sort of old account on my IP and it doesn't allow me to sign up. I don't have access to the old account nor it's e-mail so I can't recover it.
It links me to this account when I try creating a new account: (removed)
Is it possible to delete it so I can create a new one? Thanks in advance.

 

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