The open source DEBs are being generated internally for v17 and should be published publicly the same as SRPMs are for RPMs in v16 (although that’s had hiccups in the past as well.) There are some internal tickets open to address this that are currently undergoing QA testing.
As for reproducible builds, we can try making that happen, but for reference, the current Debian policy manual v4.7.2.0 section 4.15 Reproducibility says “Packages should build reproducibly” – not must – and that’s for their official packages, which OP is not referring to.