Apologies if this has been answered elsewhere, but with 3510 posts to trawl through, hopefully you can forgive me.
Why does the backstay come down to a point on deck some way forward of the transom? Bringing it down to the transom would give a slightly better angle for tensioning the forestay, and would allow a bit more roach on the main (a bit more area on what is a smallish main for a heavy boat is always useful downwind). I know you'll have your reasons, I just can't work out what they are.
That's a huge volume of water that has to be pumped through for every bit of rubbish collected - even in a heavily littered area of water, think how much water their is for each item of litter. So that's a lot of energy required to power the pump for each piece of litter removed.
Furthermore, it can only remove rubbish that is floating high on the water, with little draught (you'll note that they demonstrate it with an empty drinks can, that hasn't yet started filling up with water). Anything with a bit more draught won't get collected, and worse than that, will get held around the bin by the general inflowing current and once enough of this deeper draught litter (or even seaweed) has built up around the bin, it will block the lighter stuff from getting sucked in.
I've spent a good chunk of my engineering career either doing the engineering for 'green' companies, or assessing their proposals on behalf of potential funders. While all are well intentioned, unfortunately the vast majority are fundamentally flawed. While I'm going to give them the benefit of doubt, having not looked into the details of their proposals, I suspect that this is one that falls into the 'flawed' category.