The website is showing that an a11y is coming from the React form component:
https://www.patternfly.org/v4/documentation/react/components/form/

The issue:
"Radio inputs with the same name attribute value must be part of a group"

Aligning with what we have in Core (https://pf4.patternfly.org/demos/BasicForms/examples/) will help as they will be converted to "checks" and have the correct a11y traits.