2nd generation doorbell - does it need a resistor?

The help centre article for the 2nd generation Ring video doorbell (see table in the link below says: “ **resistor not needed when hardwiring"** [https://support.ring.com/hc/en-gb/articles/360045514872-The-difference-between-the-Ring-Video-Doorbell-1st-generation-and-Ring-Video-Doorbell-2nd-generation-](https://support.ring.com/hc/en-gb/articles/360045514872-The-difference-between-the-Ring-Video-Doorbell-1st-generation-and-Ring-Video-Doorbell-2nd-generation-) However the instruction manual for the 2nd generation Ring video doorbell (see attached) says at the bottom right on page 13 **“If wiring directly to a doorbell transformer, connect a 25 ohm, 50W wirewound resistor in series with one of the doorbell wires to protect your Video Doorbell.”** So which is correct? Does the 2nd generation Ring video doorbell need a resistor when hardwired, or not?