Never tried it but I would have thought you’d want to be connected to Trainer Road, whereas I think the blurb says otherwise.
The interactive home trainers models Avanti, Justo, Justo 2, Rivo, Direto XR, Direto XRT, Direto XR with Zwift Cog and Click, Direto XR Team, Direto X and Direto, Suito and Suito T can be used without being connected to a training app/software and/or power source, without affecting its efficiency.
These home trainers feature two different stand-alone modes that can be managed by the user using My E-Training: