It's little bit wrong..
The links the chain manufacturers provide as joining links have softer ends to allow them to be swaged over by home (and dealer) mechanics.
A chain supplied as 'endless' will have hard links all round.
So, a chain with a joining link will never become endless. When splitting a chain I always search for a joint because that will push through with little effort. Trying to 'break' an endless chain is best done by grinding off the hard rivets first.
And, as a point of interest, there is nothing wrong with a, correctly fitte