Yes. Matter takes your privacy seriously.
All skill-based feedback you receive is completely private. Your feedback can only be seen by securely logging into your account.
Who can use this: Every member on the Pro and Enterprise plans, or on any plan during the free trial, once an admin turns on performance feedback.
For an overview of the whole feature, read the Performance Feedback Guide. Related articles: How to cancel a continuous feedback request? and How often can I request continuous feedback?
Additionally, who you ask for feedback and who you receive feedback from on Matter is entirely private and secure.