Do I have to pay my ITR?

For context, i have received an email from BIR reminder to pay my AITR for 2025. I work as a COSW in a government agency, and labeled as self-employed. Then sa annex b-2 na binigay sa amin, naka tick yung 8% which indicates this

'Eight Percent (8%) income tax rate under Section 24(A)(2)(b) of the Tax Code, as amended, based on gross receipts/sales and other non-operating income - with this selection, I understand that this is in lieu of the graduated income tax rates and the Percentage Tax under Section 116 of the Tax Code, as amended; thus, no withholding tax shall be made'

It wasn't really discussed during our orientation, any help will do. Thank you!