I didn't understand how hammer on and pull off can help me to reduce the noise

I watched this video from Bernth, and as I understood from the video, he says that I shouldn't only use palm muting, but also add hammer-on and pull-off training to reduce the noise, but I didn't understand how hammer-on and pull-off are going to help me to mute the strings.

This is the video and the correct timing is 2:56 https://youtu.be/Jn2sPQ2KxGE?t=176

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