All right if there was ANY doubt that this account is DSP's I have another silver bullet thanks to the sleuthing by TJGamebox.
The latest guild used an app called "Line" as a way for members to communicate with one another. Line is basically another "WhatsApp" I guess.
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Line requires a phone number to register an account with it. You can't just put any phone number in, because a verification number is sent to your phone to confirm you want to register a Line account with that phone number.
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If you look up accounts and enter DSP's phone number you find something rather telling:
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And to prove it's not a photoshop:
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