It’s not a “default” plane. You must have purchased it in 2020 from the Marketplace. It’s a Marketplace plane from a 3rd party vendor with nothing to do with any of the Microsoft planes. Many 3rd party planes are coming through as part of the “Your 2020 aircraft will work without modification in 2024” statement from Microsoft. It was always their intention that your 2020 purchases would not be thrown away with the move to 2024. It’s proven difficult to do, but they’re working hard to make it true.
Unless it’s a new ad thing from Microsoft? Certainly looks like an ad to me.