I haven't watched the video, but to be honest I don't think this solution is worth for most people given the price. In the long run, it's much cheaper to use a Windows device with a good remote desktop app like Jump desktop.
I have been using Windows on my iPads for years and since the magic keyboard arrive the experience has been pushed to another level. Now that I have a M1 Mac mini I tend to use that more often to remote into but I still remote quite a bit into Windows for work, including at home. Given the prices in around one year you have paid a similarly specced Windows PC in most cases.... (assuming you don't have one already...)