Pointless to squabble over the idea that there is some fixed 'proportion' so let me offer this -
Body langugage and facial expressions are entire, distinct channels that primarily communicate information around emotion and attitude towards objects of attention. How relevant this information in any given situation is one question.
The impact of those channels not being there, and the ability (let alone willingness) of senders and receivers (read: people in an interaction) to send and interpret that information over another channel is a whole other matter.
Body langugage and facial expressions are entire, distinct channels that primarily communicate information around emotion and attitude towards objects of attention. How relevant this information in any given situation is one question.
The impact of those channels not being there, and the ability (let alone willingness) of senders and receivers (read: people in an interaction) to send and interpret that information over another channel is a whole other matter.