You may see this page while opening a Report link from Salesforce. Salesforce requires you to be logged in to view Report info.
The message shows:
To access this page, you have to log in to Salesforce.
Using the Sawfish plugin you can create a shareable public link on your WordPress website. Any user can click on the link to get the real-time data of the records in CSV format. This can then be easily viewed in Excel.