It's ashame that the V70 is too far gone, but at least your friend bought it cheap, and he got your Volvo in the end 😄 I don't mind you having your friends on the channel and showing their fleets of Hoopties... It adds a bit of depth and fun to the channel...

Given it has a sunroof, check for water leak damage to the car's computers...

I think you have to ground the spark plug body to the car frame (battery negative) in order to get a spark while cranking. The intermittent sparking you saw may have occurred when your body accidentally became the "ground". Either way, your low compression test results kinda made that a moot point. Good video. Too bad you can't save that car - it looks real good and has low miles.