They may have been solving similar problems then, and they may be optimized for different things now. But Web components are a web standard, and React is not. Pushing for web standard technologies is inherently unbiased because that's just betting on the platform. This results in pushing for platform improvements (like declarative shadow dom so it plays well with SSR, etc), and then everyone benefits.
IMO it'd only be a bias take if web components were branded as having no issues whatsoever, or that they are the most optimal solution for everything. I think it's okay to say, "web components currently don't solve my problems and that's why I'm looking to use something else like React or Solid". However, I've not seen this sentiment shared when it's the other way around with React. It's always "no one got fired for picking React" instead of actually evaluating what will deliver the most value to your users.