It's unclear whether this was a subtle reference to Matthews, who had won the MVP award the previous year, or simply a coincidence. The image was also interestingly not taken at Edmonton, where McDavid achieved his 60th goal, but rather during an away game against the Arizona Coyotes.
Some fans speculate that this was a deliberate attempt to insult the Leafs or that the NHL has a bias against the team. However, it's more likely that the choice of image was simply due to graphic design considerations and the fact that the away game chosen happened to be against Toronto. While some fans may believe in conspiracies, it's important to remember that the simplest explanation is usually the correct one.