Just for us that doesnt know everything.
I would recommend to change "reload install process" to composer run-script post-create-project-cmd, so we dont need to open the composer.json file to see which commands there is.
Because, "reload install process" this sounds like "run the same command again", which means I would run composer create-project thelia/thelia-project thelia which ofcourse fails, because the directory is not empty anymore.