We're very open about how TestFiltering works. You can read more in our FAQs: https://testfiltering.com/faq/
With the new changes to Keeping Children Safe in Education and the Standards, your DSL should be leading this, supported by the IT team.
It's also worth noting that TestFiltering is only part of the annual review and that if you discover something concerning in the logs there should be a process for reporting this to your DSL.