Based on discussions on Slack:

The issue is caused by the GDPR implementation in Europe. As a consequence, Einstein@home has restricted the information access so that they are able to tell the authorities who is consuming the personal data that they explicity publish in order to protect themselves from a legal perspective.

The Gridcoin development team (@ifoggz) is currently creating a tool (scraper) that will allow the extraction of required information from E@H's website so that the project can be whitelisted again. The tool is currently in testing with a few minor modifications to be done.

As a side note, Primegrid is also restricting the access to personal data but fortunately the same tool can be used with this project as well.