Not everyone makes a lot of noise when being spanked. Some of us are the stoic type. This doesn’t always work for some people because it doesn’t give the spanker a lot of information into how the spankee is feeling. This doesn’t mean we’re not enjoying it, or that we’re just “putting up” with it (though sometimes this happens), it just means we’re not as vocal. The spanker just has to check in with the spankee more often to make sure everything is ok, or just really understand and tune into non-verbal signals.
Now I love to be fingered and spanked and I would probably make a lot more noise than the lady in the video, but to each their own!