Could this work

Yes it would work. But if you want it to be reliable over the long term you'd need to solder it.

does this remind you of something?

Would mostly depend what the larger wire is being used for.

In India its the preferred method

Yes, depending on the load. Really needs fault protection to be safe.

The green wire is just a ground. That’s what he’s doing is adding a ground to earth. He’s not splicing into the circuit. If that’s what ur asking.

Aluminum wire?

It would work but would a qualified electrician do it not a chance

Or use a connector designed and rated for such a splice, not this third world fire bomb.

Or we could put a moose in space