Here is a transcript from MCUXPresso's CDT Build Console :
Performing post-build steps
arm-none-eabi-objcopy -v -I ihex -O binary "X.hex" "X.bin" ; OtaUpdatePackageCreator -p "..\UpdatePackageConfig.txt"
copy from `X.hex' [ihex] to `X.bin' [binary]
OtaUpdatePackageCreator -p ..\UpdatePackageConfig.txt
Stdout from objcopy is echoed in the build console.
Stdout from OtaUpdatePackageCreator is not.
However, console output is indeed produced when the latter is run in a Windows cmd shell
C:\bldUtils\>OtaUpdatePackageCreator -p UpdatePackageConfig.txt
Ver: 11
In: X.bin, capk.bin
Out: updPkgV11.bin
C:\bldUtils\>
Any insights why this is?