Lucky it could be but there were about over 65 minutes after the red card for van Dijk that Newcastle could have taken advantage of but they failed to do so, one of the keys was the coach's cleverness to apply strategy when things went wrong and Jurgen Klopp proved the more experienced in comparison Eddie Howe.
The key is how Klopp made substitutions when his team had to play with 10 players, of course there were players who were not happy with this decision, Luiz Diaz had to be replaced by Joe Gomez to close the gap on defense by only allowing two strikers in front, of course he felt it was not a pleasant thing moreover he has proven himself to be able to score in previous matches, but substitutions and changes in strategy are very helpful when something unexpected happens.
But I agree that Newcastle didn't play badly in fact in some ways they are better than Liverpool but the team has to score goals to win not just have possession of the ball because that doesn't give points, and the match provided additional experience for Howe to be able to bring his team even better.