Unfortunately, the Tenda node does not have a built-in VDSL modem. Although the telephone RJ11 jack may physically fit, don't try this as there is a risk it could damage the port. The telephone line also carries about 48v voltage, so even if it doesn't buckle the pins, the high voltage could cause internal damage.
The PPPoE is for legacy DSL modems that depend on a separate Ethernet-only router. I haven't seen one of them in around 15 years.
If your router has a "Bridge Mode" setting, this will also turn it into a passive DSL modem, in which case you would configure the Tenda for PPPoE. The catch here is that you will no longer be able to access your router's web interface with bridge mode enabled, at least not easily.
The PPPoE is for legacy DSL modems that depend on a separate Ethernet-only router. I haven't seen one of them in around 15 years.
If your router has a "Bridge Mode" setting, this will also turn it into a passive DSL modem, in which case you would configure the Tenda for PPPoE. The catch here is that you will no longer be able to access your router's web interface with bridge mode enabled, at least not easily.