It is at least for pricing.

The deadline for purchasing QuickBooks Desktop Pro, Premier, Mac, and Accountant editions for 2021 is December 10, 2021. These one-time licenses will be supported through May 2024, after which they will become sunsetted.

Starting with QuickBooks Desktop 2022 products, an annual subscription will be required. There is no monthly option to pay, but if canceled before the end of the subscription, a pro-rated refund will be provided.

I have been seeing changes in QuickBooks Desktop that are closely resembling QuickBooks Online. For example, there is now a third version of Bank Feeds called Advanced Mode that was implemented in the Desktop 2021 PC versions that looks very similar and functions like the Banking page in QuickBooks Online. It is almost as if Desktop is becoming a hybrid of Windows programming with embedded web pages. This is probably signaling a true end to desktop sometime in the future.