Confusing code generation for GoLang client

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Description

I have just generated an API client for a ASP .NET web app with the spec generated from Swashbuckle.

Browsing the generated code I came across an odd conditional that doesn't make much sense.

The conditional starts with >= 300 but includes an inner conditional with == 200?

if localVarHttpResponse.StatusCode >= 300 {
		newErr := GenericSwaggerError{
			body:  localVarBody,
			error: localVarHttpResponse.Status,
		}
		if localVarHttpResponse.StatusCode == 200 {
			var v MinimalArticleDto
			err = a.client.decode(&v, localVarBody, localVarHttpResponse.Header.Get("Content-Type"))
			if err != nil {
				newErr.error = err.Error()
				return localVarReturnValue, localVarHttpResponse, newErr
			}
			newErr.model = v
			return localVarReturnValue, localVarHttpResponse, newErr
		}
		if localVarHttpResponse.StatusCode == 404 {
			var v ModelMap
			err = a.client.decode(&v, localVarBody, localVarHttpResponse.Header.Get("Content-Type"))
			if err != nil {
				newErr.error = err.Error()
				return localVarReturnValue, localVarHttpResponse, newErr
			}
			newErr.model = v
			return localVarReturnValue, localVarHttpResponse, newErr
		}
		return localVarReturnValue, localVarHttpResponse, newErr
}

I've stared at it for while thinking I am missing something but the check for a 200 seems pointless considering the previous check for >= 300?

If someone could explain the logic behind this it'd be great?