Question about Onkyo TX-SR494DAB

In the operating instructions and on the device there is nothing about eARC, only ARC. eARC is supposed to have a larger bandwidth and allow audio formats such as Dolby Atmos and co. However, I have only connected the receiver via HDMI cable and can transfer titles with Dolby Atmos signal from the TV to the device, whereby Atmos is then also played. I hope this has helped.