If it's really fully compatible with docx files, I'm very interested in this. No matter the advances Apple makes with the M chips, Office apps are always slow to open. Not to mention the obligatory background services.
From the comparison image it looks like the goal is functional compatibility, not render compatibility. The table borders change and the layout changes.
If it’s vibe coded, it’ll use one of the OSS libraries for importing word, so the answer is no it isn’t compatible and the website is misleading slop.