Yeah, I saw that too. Just tried it out. Big downside is that it's only available on the app, not the full desktop site. Listing on the app in general is really poor compared to the desktop so a shame that this one feature is app only.

It does have, among a whole range of AI generated backdrops from marble, wood etc to beaches, forests and cities, an option for plain white. The only problem is that, once you apply it and submit the listing, it changes it to the bloody 5% grey again! 🙄 

That ↑ is not what I call white!