If I may ask: what problem does this solve?
Looks like it's similar to mirrord or DevSpace, it's for developing components in Kubernetes clusters without having to rebuild an image and redeploying every time you want to test it.
Are you sure? I mean, if it's printed text in a non-connected script, where characters repeat themselves (nearly) identically, then ok, but if you're looking at handwriting - couldn't one argue that it's _words_ that get recognized? And that's ignoring the question of textual context, i.e. recognizing based on what you know the rest of the sentence to be.
Example: https://images.squarespace-cdn.com/content/v1/58586fa5ebbd1a...
There are probably some flaws here as well, but you need to study the picture in detail. And Flow used the fast renderer of Blender, not the quality one.
Still, it does have a unique style that is much more interesting than many other animated movies. So what is technically impressive, just throwing more compute at it to make it photorealistic?
I think art style will have a larger impact. In a way it is technically impressive as it didn't need a lot of compute power.