He isn';t doing gigabit ethernet, outside in a street box. He is doing a phone in a nice domestic env.
All any tool has to do is support the wire on either side of the tines of the connector, and get it down to the bottom without spreading the tines.
A credit card with a slot in it is fine for a couple of goes.
Its actually pretty good without a slot in it, as most tines merely groove the card.
Tows screwdrivers accurately placed work well too. One screwdriver is dodgy, as it may well spread the tines if its not very narrow.
But the back of a Stanley knife IS narrow enough..
However I don't like pressing down on the 'sharp edge' ;-)