Man pages matching name spreadsheet::parsexlsx::decryptor in section 3pm:

Spreadsheet::ParseXLSX::Decryptor.3pm.en	debian 10 / libspreadsheet-parsexlsx-perl
Spreadsheet::ParseXLSX::Decryptor.3pm.en	debian 11 / libspreadsheet-parsexlsx-perl
Spreadsheet::ParseXLSX::Decryptor.3pm.en	debian 12 / libspreadsheet-parsexlsx-perl