Looks like this is just how TideSDK Developer is created, this is how it launches the app (notice the 5th line for ignore):
PackageProject.currentAppPID = TiDev.launchPython(
[PackageProject.desktopPackage.toString(),
"-d", dest.toString(), // Staging directory
"-a", assets.toString(), // Assets path
"-i", 'dist,packages', // Ignore
"-n", // Don't include the installer
"-r", // Run it!
"-v", // Verbose
"-s", basePath.toString(), // SDK path
appdir.toString()]);