I think that would be false. Using facial expressions help to know what a person is feeling.
Examples-
Frowning will lead to being sad, mad, or just disgust.
A big smile would look like you're being happy and exited about something or someone.
Body postures also helps as well.
Examples-
Jumping up and down while smiling would look like you're very happy.
Arms crossed with an angry face will be known as being mad, disturbed, etc.
Hope this helps!
---JUSTAVERY
