The missing option in 'General' facet is no reason to worry. Your Test Receiver is supported with all available options. In this example FSL-B7 is not displayed, because instrument option has no influence on available ELEKTRA settings.
ELEKTRA does follow the general rule that the tab 'General' of DeviceList only displays those options that are relevant for ELEKTRA for the measurement/settings.
For ESL, the FSL-B7 is always available as a build-in option, it cannot be removed or ordered separately. Because of this it is not needed to display this option.