Your own article literally says the logo was not based on sourdough bread.

The Xbox X symbol didn't draw inspiration from sourdough, but rather emerged from the name 'DirectX Box.' Crafted from Dell PC spare parts, the original Xbox prototype underwent various name changes before settling on Xbox, complete with its distinctive acid green colors to boldly differentiate it from the PlayStation. This brand evolution predates Blackley's ancient sourdough experiments, and the more rounded X symbol only made its appearance in 2005 with the launch of the Xbox 360.