It all seems in order.
When I run it against our three new docs categories (created around 10 days ago) using the same AND t.created_at > '2022-01-01' I’m not seeing any data from outside of those categories being pulled in (lot of small action posts though, which you may want to filter out depending on what your use case is). Running it without the AND t.created_at > '2022-01-01' entirely also only pulls in data from those categories.