This was my understanding as well, but earlier I couldn't find any documentation to prove this so I never wrote a comment.
CloudTrail can be configured to save logs to S3 or CloudWatch Logs, but I think that even if you were to disable, delete, or tamper with these logs, you can still search and download unaltered logs directly from AWS using the CloudTrail Events page.
CloudTrail can be configured to save logs to S3 or CloudWatch Logs, but I think that even if you were to disable, delete, or tamper with these logs, you can still search and download unaltered logs directly from AWS using the CloudTrail Events page.