I’m sorry but I will need to have more information than that from the article you posted. In it the writer said that hollow point ammunition is for better penetration. Nothing is further from the truth. Hollow point bullets are designed to begin expanding and spreading upon imapct with soft tissue. Full metal jackets aid better penetration through hard objects. If they can’t get this information right why would I believe they get the rest right?
I don’t know for sure but I think they were talking about many hollow points when fired at a target wearing heavy clothes will fill the hollow cavity with cloth and then not expand.
They have developed HP bullets which are supposed to not have that tendency.
Vat iss your name, herr comrade?