That depends on the size of the toast, appearance and frequency. We (an MSP) used a Windows toast notification[1] to encourage people initiate the Win10 > Win11 upgrade at their own convenient time (before it gets forced down on them) - and we got a pretty high uptake. The overall feedback from both the project team and users were good: the toast was unmissable, the text explanation was clear, and the big banner image was eye catching.

https://www.imab.dk/windows-10-toast-notification-script/

If it has all of:

a "big banner image", buttons that are required to interact or dismiss, doesn't go away on its own after only a couple seconds, and might(?) also exist in the notification center

I think it's pretty safe to label that "definitely not a toast". That's just a notification, or maybe a "non-modal alert". Toasts are distinct from those by being brief and ephemeral.