Yesterday I replaced my files with a single txt file containing the reason for their deletion.
Then I placed these files in "archived and no longer supported by the author"
Which means that I no longer have access to the visibility page to permanently delete the files.
Finally, I found the small icon at the very bottom left of the visibility page...
My 3 scenes LFTH - LFRL - LFTF and my D5 Turbi plane will be available on the site http://restauravia.fr/html/msfs.html