On July 1, 2018 the Penguins signed defenseman Jack Johnson. As you could tell from the title of the Pensburgh article (“Regrettably, Penguins sign Jack Johnson for 5 years” detailing the transaction, it was bound to damage the team from day one.
Indeed, it lived up to its billing. In the two seasons Johnson played with the Pens, while he was on ice at 5v5, the Pens allowed 109 goals against. If a goal was scored while Jack Johnson was on the ice at 5v5, 55.6% of the time the opponent scored that goal.