Curiously, the page you've linked explains that it isn't normal to use it in this case: "can only be used with a morphologically and syntactically singular ante

Curiously, the page you've linked explains that it isn't normal to use it in this case: "can only be used with a morphologically and syntactically singular antecedent when what it refers to is semantically collective and/or generic and/or indefinite and/or unknown".