Interesting,
See also: Anyone experienced low level interference/ contamination issues with NDBA during method development? - #2 by IreneNS
Would be useful to know if NDBA leaching from IV bag is demonstrated also when no IV bag ports (cf. possible rubber seal NDBA risk, linked with zinc dibutyldithiocarbamate) are used to sample the liquid for testing (and which IV bag types have shown a risk, as there are many polymer types).
But I guess indeed inkjet printing is sufficiently common for IV bags, and dibutylamine use in inkjet inks as well to support the plausibility of the root cause (probably liquid sampled from unprinted bags have been tested as well to shown absence).