That's a fair point. It still is a misleading plot since it isn't an estimate cod population, and isn't representative of population after 1992. As you said the numbers are still bleak. I found this plot
, Source , which does tell a similar story around the early 90s but indicates greater recovery in more recent years.
This is kind of misleading since they closed the fishery (I think in the 90s), so the amount of cod catch would naturally plummet. The fishery did, however, need to be closed due to overfishing.
I don't think acoustic cargo bikes are super common these days. The best two options I can think of that might fit your needs are the Tern Short Haul D8 or the BikeFriday Haul-a-Day. I'm not personally familiar with either but heard great things about BikeFriday bikes (plus I'm a sucker for folding bikes).
You could also consider something like the Crust clydesdale fork. I've never used it myself but heard it's great. Only issue is that it's usually out of stock. It may seem like a lot of money for a fork but it's still cheaper than any other cargo option available, especially if you can find a cheap frame to use it on.