At least as far as my ec2 menu’s are concerned, Systems Manager is no longer there. It has been moved to its own section under AWS Services.
You’re right; it’s moved to it’s own new section in the UI. Where Systems Manager was originally part of EC2 providing some automation tasks, it’s since grown into being its own fully-fledged service with lots of features and capabilities beyond just EC2. We’re aware of this, and planning to update our videos to showcase this change
Feedback can also be submitted directly to us through our Contact Support form, where one of our technical team members will respond and assess what we need to do to update our content