so it's basically reading it from the last known outcome of the prior CHECKDB that was successful.
Correct. It's printing out the date and time last known good CheckDB run. In the case of the one I listed, I haven't run a CheckDB on that database in a year (it is a test database)
That info is stored in the database's boot page and printed out whenever SQL brings the DB online (service start, restore, attach, set online)
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