The seven-time world champion wasn’t impressed by the world number three’s display.
There are six former world champions left in the hunt for glory this year.
It’s the 11th ranking event quarter-final that he has reached this season.
The Welshman is through to the last eight for the tenth time in his career.
The Australian has reached the last eight at the Crucible Theatre for the third year on the trot.
The Scot knocked out a reigning world champion at the Crucible for the second time in his career.
There was only a slim chance of him not finishing in top spot after the 2020/21 campaign.
The former champion is through to the last 16 for the third year in a row.
His decision comes during the 2021 World Snooker Championship at the Crucible Theatre in Sheffield.