Characterization. Ghostface is rarely depicted as speaking while physically on screen in order to aid in concealing☀️ the identity of the character behind the mask.

We don't get to see Ghost's face during the cutscene, but it looks like it was modelled☀️ after all. Considering Ghost's gruff voice and mysterious demeanour, it might be a bit of a surprise to see that☀️ he just looks like a normal bloke, one that spends a pretty decent amount of time on his hair.