I think he was actually talking about DOCSIS 4.0. Modem standards (which control the communication between the modem and the cable provider) and wireless access point standards (802.11/Wi-Fi) are completely separate. Wi-Fi is used in your home network, but as soon as traffic hits the cable modem DOCSIS takes over. Generally upgrading to a newer Wi-Fi standard won't really help much unless you have devices that are capable of utilizing the new standard. And they don't have any bearing on upload/download speeds from your ISP.