Then you might as well equivalently argue that MongoDB is a reliable basis for LTS software because every distro packages it and there are Python drivers for it

Then you might as well equivalently argue that MongoDB is a reliable basis for LTS software because every distro packages it and there are Python drivers for it. The initial argument implied that SQLite was totally embedded in Python itself, which is not quite true. It still depends on the availability of separately-maintained & compatible SQLite libraries.