As noted in the Access Data Explorer section of the Cloud Manager documentation:

Data Explorer is not available for Trial/Evaluation versions of Cloud Manager.

However, on the Cloud Manager website (https://www.mongodb.com/cloud/cloud-manager), under Features and Pricing it states:

All Cloud Manager accounts start with a 30-day free trial of Cloud Manager Standard.

So, they will have access to Data Explorer for the first 30 days, but then lose it if they fall back to the Free Plan.

I think the docs should be changed to be more in line with what the website is describing and clear up any confusion.

Perhaps something like this:

Data Explorer is not available for Cloud Manager Free after the initial 30-day trial.