He mentions that this is his buddy's bike.
That rubbing compound is pretty abrasive stuff. I'd recommend something like that only for the worst of scratches but I'd also follow up with a lighter compound to remove any remaining cutting marks (these show up in the sun from some angles)
I like Chemical Guys stuff. I just recently used V34 and V38 compound on my truck after someone messed it up in a parking lot. Truck came out awesome
Agreed, you always start with the least abrasive method to remove. Meguiars SwirlX is low on the abrasives scale and will remove quite a bit of scratches/swirls and blemishes (fine polish). Anytime you use a rubbing compound you should follow up with a finer polish just like you would with sandpaper to get a good finish back just as Aeson mentioned.
If you're using a microfiber towel, start with a paste wax to see if it'll remove the scratch before any polishing chemical, people forget microfiber has cutting power and actually already helps to remove surface scuffs, that would technically be one of the least abrasive methods to start with then follow up with a fine polish next etc.
I still have my R3 wouldn't trade that in for the world. that was my friends cbr600 Yes I have tried other less abrasive methods to remove the marks but those didn't work on his bike that's why I use the rubbing compound, the rubbing compound didn't leave any fine scratches , just only removed the mark. if you have a lite mark then the other methods would work just fine, but this one was a tough one.