Does airport support VDSL2?

The current version of the AirPort Express is the 2nd Gen model. A 5th Gen AirPort would be an AirPort Extreme.

Both the AirPort Express and AirPort Extreme support VDSL2. Depending on the type of modem that you have, the AirPort would use either a DHCP or PPPoE type of connection.

Would help if you could tell us where you live, who your Internet Service Provider might be, as well as the make and model number of the modem that you plan to use.

Sorry, I am not familiar with Plusnet.

Need to know whether your modem will provide a DHCP connection, a PPPoE signal or PPPoA. AirPorts support DHCP and PPPoE, but not PPPoA.....and PPPoA is used commonly in the U.K.

The information that I could find on the Plusnet website indicates that Plusnet will provide a wireless modem/router with all of their packages. That being the case, if you wanted to connect the AirPort Extreme to the Plusnet modem/router, you would use the DHCP connection method to connect the AirPort router.

You may not need two wireless networks, so you could turn off the wireless function on either the Plusnet modem/router or the AirPort Extreme. We can tell you how to do this on an AirPort Extreme, but you will need to get with Plusnet support if you want to turn off the wireless on their modem/router.