Are electric fields from a shielded power cord reduced onto a connected device as well?

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Hi, I have a question for the electric fields from a shielded power cord just like this DIY topic discussed from https://support.electrahealth.com/communities/4/topics/9667-do-it-yourself-kit-to-retro-shield-any-cord

If electric fields emitted from a DIY grounded power cord is reduced, does it simply reduce the radiation around the cord or does it also reduce the electric fields coming into the device itself that this DIY grounded power cord is connected to? Please let me know. Thanks.