.... It certainly offers good results as his video demonstrates and I have no doubt many find it really useful - It's me, and people like me, who don't want to have to initially write a deeper level script to set up each design. So applying border styles in Affinity publisher V2 is easier.
Another alternative, if you are a ON1 RAW 2023 user, is their AI Resize which is also available as standalone, I think(?). It offers the ability to extend images to wrap around edges such as when block mounting but does so by adding and therefore restains your original image without cropping it < Another clever use of AI.
"There is more than one way to skin a cat" as the expression goes.