Can he still access my Netflix by changing passwords?

N / A

Ne the person has to log in again

Good haha

No then he has to log in again with the new password, provided the box below is ticked.

:)

No, if the password is changed, you will be kicked out of the account and have to log in again with the new password

If the option is activated as shown in the picture, you have to log in to all other devices with the new password.

You still have to click on Account> Settings then on "https://www.netflix.com/ManageDevices" to log off all devices and you have to log in again (with a new password)