G29 P3 isn't intended to populate an empty, unprobed mesh.
The reason for manually probing the corners of the bed were to see how it is tilted. I think you should try to physically level it a little bit better. You have .75 mm of difference across the bed. Which is 3 layers.
But when you do try to fill the mesh... You can use G29 P3 C #.### R # to populate values where the nozzle is.
And YES... That comment is backwards... That need to be fixed....
The reason for manually probing the corners of the bed were to see how it is tilted. I think you should try to physically level it a little bit better. You have .75 mm of difference across the bed. Which is 3 layers.
But when you do try to fill the mesh... You can use G29 P3 C #.### R # to populate values where the nozzle is.
And YES... That comment is backwards... That need to be fixed....