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For lack of a better name, this is called an observation by the user that came up with it. This user explains that all of the numbers in the dark red cells in any sudoku puzzle are the exact same numbers in the blue cells. See the sudoku grid below.
Try this: look at any completed sudoku puzzle and list all of the numbers in red cells, and you will find the same list of numbers in the blue cells. Amazing, but true: this works for any puzzle!
We can sometimes use this to help solve a puzzle. Sudoku Primer video 220 that will be published this Friday (December 25, 2020) on the YouTube Sudoku Primer channel will show an example of how you can use this information to find a number.
The original location of this observation (German)
More interesting facts
These are fun to read
The 2020 championship was held in Hyderabad, India in January
14th World Sudoku Championship and 28th World Puzzle Championship in Kirchheim, Germany
Championship held in Prague, Czech Republic
Check here for the latest Economic Times news about sudoku
Article about Simon Anthony and his YouTube channel "Cracking the Cryptic"
Read about the puzzle that spread like a virus
Here's Robin's story, from the Kelowna News
Sudoku - the puzzle that addicts