What gives him away is that he assumes you know how to call him. Scammers don't do that and ask instead to send them your emails and password per Mail or text message. Totally not a scammer, busted at first glance.
Some scammers are getting into sophisticated targeting, it's not outside the realm of possibility they've sim-swapped Dad's phone and intentionally worded it like that knowing you'd call that number and they'd be able to intercept it. Hell these days if they are able to get just seconds of your dad's voice they'd even be able to have a convincing AI voice on the other end