In that article the primary purpose seems to be to reduce soundwaves rather than preventing fish from passing through, so both sources are in agreement there th

In that article the primary purpose seems to be to reduce soundwaves rather than preventing fish from passing through, so both sources are in agreement there that it lessens soundwaves. Also the pressures could be different. It's not hard to imagine that higher pressure would act as a bigger deterrent to passing through, so maybe that's what they're using at the construction site? Both the bubble barrier page and the article you linked are fairly short on specifics though, which is a shame. It wouldn't be that hard to write out some pressures...