So presumably you can still update an early installed version of 1903 straight up to 1909 with a 1909 ISO you have downloaded – without needing to do all the cumulative updates outstanding and then having to go through the Windows update full download of 1909 process ?
I ask, because one of the guys I support only has 1 mb broadband (at the very best) but runs 3 machines – so I usually download the cumulative updates and new ISOs for him and give them to him on a USB stick so he can install them off-line and thus make the best use of the very poor connection he has.
Never trust an atom - they make up everything !