Your comments

Forget my last. Just realised it was Working Copy

I’ve not seen that Copy app shown on the video. Where would I find it?

Not a very shortcut but you could use:

Ctrl A
Shft Cmd right arrow
Backspace
I have created a keyboard map mainly for use with the Logitech Ultrathin Keyboard but you might also find it useful. Go to http://www.tonydow.me.uk/LUKM.pdf 
Regards, Tony Dow
If you are at the end of a line Cmd Backspace deletes to beginning of line.