Dutch Flat Mates 3: What do Dutch Flat Mates do in #Sudoku?

Today's Puzzle:

A new series from Flinty with a variant on the Dutch Whispers line. Now 5's demand to have a 1 or 9 next to them and it plays beautifully.

Link to Play Along:

Dutch Flat Mates 3 by Flinty https://tinyurl.com/SudokuSleuthDutchFlatMates3

Dutch Flat Mates 1 by Flinty https://tinyurl.com/SudokuSleuthDutchFlatMates1

Rules:

Normal Sudoku rules apply.

All 5's in the grid are Dutch, and must strictly have EITHER; a '1' directly above it, OR a '9' directly below it. It may have both, but it doesn't need both.

German Whisper Lines Two cells connected by a green, German whisper, line must have a difference of at least 5.