I know artist speculation has a special clause for BST entries, but this feels totally based on nothing. I feel like this exception to the rule is far more harmful to the implied factual nature of RemyWiki than it is good.
I think it's pretty likely that it's TAKA given his SETUP from BERLIN alias considering S-Bahn is the berlin rail network, but it's still very heavy speculation, the same as implying it's Syunn with no evidence.