Carole, you have an eagle eye! 😀
I checked the file again and remembered I didn’t use the Overlay in the end.
I tried it (halftone 05 overlay), but I decided to go the same route you showed in the video.
New Layer > Flood Fill with a lighter shade of the background color + Grass Texture.
I thought the result was a bit too dark, so I duplicated the Texture Layer and changed the Blend Mode to SCREEN.
I loved your tip: Flood Fill Active, hold the Ctrl Key, and it changes to Dropper Tool.