The version is distinct from the 32-bit (x86) version. A 64-bit ISO allows you to:
Factory floors with air-gapped PCs (no internet) do not need security updates. They need stability. If the factory software was certified on 1903, the IT team will stick to it for a decade. windows 10 1903 iso 64 bit
The is a historical artifact of a transitional period in desktop computing. While it offers a nostalgic "pure" Windows 10 experience without the cloud integrations of later builds, its lack of security updates makes it dangerous for general use. The version is distinct from the 32-bit (x86) version