Even outside of this obviously either clueless or AI-fabricated post, I'm still not convinced that it'll be OSS, in the way that we expect it to be. The phrasing used in announcement leads me to believing that they'll use some license, that allows them draconian control over the source. It'll be "open" as in being able to see it, but not really fork, or meaningfully contribute.
And it's not a particularly interesting application anyway. I'd only want to hack on it for nostalgia, and if there are any barriers to doing that, I'll just use a different app.