2009 outback stalls /engine noise

1230 pm today my daughter is driving it and it stalls at stop sign. Heavy brake pedal. Battery at 12.5V and alternator seems ok. ..starts but there is zero power. significant noise coming from underside of engine bay. Car dies if foot isn’t on gas. Car not drive able and towed to my mechanic. Car was a daily driver for person I bought from.

Tow guy said he thinks engine is bad.

I posted a video here of the noise but can link here yet..bc 1st post..

wondering if i have a junker now. Or need to install or rebuild an engine?

All input appreciated..
Buzz