I don't follow how rules for software with VPN functions could apply to a video game chat, but as with all laws intend and interpretation matters. Successfully convincing a judge that your game chat is a Class I critical product is unlikely.
I also don't think that the CRA is too vague. Rules that are too specific will just be circumvented. Enforcement works like any other market rule. You can sell all sorts of non-compliant products in the EU but if you are found out you pay a fine. It won't be any different with the CRA.