I am looking at this from the perspective of a physics student, and as far as I know, the most problematic part of Bohmian interpretation is the instantaneous non local changes in the guiding function. The paper addresses it in a section but if possible, could you shed some more light on this particular statement in the paper which I think is a pretty bold statement to make without giving any real example: "Sure, a fluid has an extended, ‘delocalized’ character, but the internal pressure may well build up without in any sense implying strongly non-local, i.e. superluminal, forces." The internal pressure builds up over time and not instantaneously in case of real fluids. So, how could the pressure build up instantaneously in this case? The influence cannot travel faster than the speed of light.