Maybe I missed it looking over the paper, or maybe they are implicit, but are you taking into account Saudi Arabia’s East-West Crude Oil Pipeline (Petroline) , I believe it does about ~7m bpd and Habshan-Fujairah (Abu Dhabi Crude Oil Pipeline / ADCOP) about ~1.5m bpd? If not you might be underestimating things, though they do take a bit of a warmup to get into capacity, and can't match completely Hormuz's flow.
This pipeline predates the data but its oil is routed to Bab-el-Mandeb which is in the network. That being said, the numbers are more of a sensible baseline as the actual flows for many countries are unknown/sanctioned.