The XY Ring: A Classic Sudoku Technique

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Today's sudoku was created for a Discord speed-setting competition y Sam Cappleman-Lynes. It's called Delirium on the basis that Sam was almost in a a trance state when he made it due to lack of sleep! Please have a go at it at the link below:

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Rules:
Normal sudoku rules apply.

SPOILER: There is some detail on the technique Simon uses in the video at the very bottom of this video description!

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Hi! We're Simon Anthony and Mark Goodliffe, two of the UK's most enthusiastic puzzle solvers. We have both represented the UK at the World Sudoku Championships and the World Puzzle Championships.

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SPOILER: As the title of the video notes, the technique is called an XY-Ring. It shares some logic with techniques like an XY-Chain and a Continuous Nice Loop. We can cover these in other videos if there is interest.