powerbi encryption at rest

I read these slides about encryption at rest: https://community.powerbi.com/oxcrx34285/attachments/oxcrx34285/DataInsightsSummit2017OnDemand/68/1/BR054.pdf

In our company we have professional secrecy data in our reports and right now we are using direct query, which means data is never stored in power bi service.

However the manipulation is very limited and we want to switch to import, but when using import data will be stored in power bi service, yes I know its encrypted, but according to the slides, the keys are managed by Microsoft.

Has this changed recently, we need to manage the encryption keys ourselves?

Thanks