ADC , Apalis TK1

For a neu projekt my company needs a single board computer with 9 analog inputs. I found the Apalie TK1 board with 21xADC, but in the description in the datasheets it says :

" The K20 features
two ADC with totally up to 21 channels that are available at the module edge connector. Only four
of these 21 channels are compatible with other Apalis modules, the other 17 channels are located
as alternate functions of other pins"

Do I understand correctly? I will have access only to 4 inputs.
Is there a way I can use all 21 channels as an input ?

To use all available channels you’ll need a custom carrier board and software.