That's empty rhetoric Pete. The Department For Exiting The EU have a huge budget, yet it's taken the European Commission to produce the report you linked to (a while ago at that). No calls for tender have been put out with vendors. No trials have been undertaken. No research of their own has been done. Absolutely nothing.
Handwave, handwave, something something remoaner gloomster Whitehall conspiracy something, repeat ad nauseum. Now that renowned man-of-his-word Johnson is at the helm it'll be different, because finally there's a man in charge that doesn't let little things like painful reality get in the way of his
electioneering... oops, I mean responsible and mature governance.
And as ever, the question is if the Brexiters are so damn sure that the technology exists (or indeed any alternative arrangement, including teams of trained leprechauns patrolling the border on their majestic Brexit unicorns, dispensing pots of gold to lorry drivers with the correct paperwork) then what's the problem with the backstop? Pass the deal, get the UK out, and wait for the alternative arrangement to be implemented some time in the transition period. Done, dusted, everything you want has come to pass, right?
Why isn't it working that way? Is it because despite insistence to the contrary, the anti-backstop agitators know there isn't any sort of workable alternative in the pipeline and realise the backstop will be in full force for the foreseeable future, stopping those glorious trade deals that, whilst won't be as good as our current ones, will at least make them and their mates personal fortunes?
Or is it because a lot of the Brexit movers and shakers don't actually want a Deal at all, because the 'transition period' sees them unable to start milking the dividends for 2 years, and why should they have to wait before they can start profiting off other people's misfortune? Esepcially if a No Deal means they start making money now, AND the chaos is far worse.