Yes, they are wrong about calling draws less exciting. 0-0 games can still have a lot of action, and many near misses. 3-0 win can be boring, one sided game.

Also, article makes another stupid claim when they try to extrapolate from a single game to average score in the whole season. A league where most games end in a draw would be very exciting, because pretty much every team would have an equal chance of winning a championship (and also of being relegated to lower league).

The most boring leagues are the ones such as French Ligue 1 or German Bundesliga, with one team clearly dominating the competition (PSG and Bayern, respectively). Premiership is probably the most exciting one, with most teams having real shot at championship.