No, the Byzantium image being fetched from storage.puri.sm has an old timestamp:
There are a few newer Byzantium images with LUKS, but by default they are not fetched by the script:
Crimson and Dawn are the rolling releases of PureOS, and the latter is currently targeted at the landing repository/suite for the Librem 5, with the former having an image build on Jenkins:
There is also the octarine repository and various debug repositories as well: