Does it say anywhere it's a guy? But also him not caring either way is enough to prove your point.
I... Need to watch more of this because what is this video. I guess a promo event for that game? I don't know why it feels so out of place to me for a Sonic game.
The twitter takeovers are game promo events where the voice actors answer twitter questions in character; realshadowfan01 is an actual guy on twitter. Sega's recently been having fun with sonic 'canon' outside of serious game plots (eg one of the gags in the takeovers about Shadow eating coffee beans with a spoon was referenced in the Murder of Sonic the Hedgehog)