Binary storage does not change what the PDF can preserve
XLSB is an Excel workbook format that can hold sheets, formulas, charts, and workbook behaviors. PDF converts a selected view into fixed pages. It is useful for reading but is not a place to continue calculations or run workbook automation.
Keep the original workbook in a trusted location if its model or data connections are needed. A PDF can be easier to circulate, but it only communicates the visible content prepared for export.