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ISO 20022 is a methodology, or recipe, which can be followed when creating financial messaging standards. ... This standard is maintained by ISO TC68 (see https://www.iso.org/committee/49650/x/catalogue/)

The standard has been used to develop many ISO 20022 compliant messages (see https://www.iso20022.org/status_of_submissions.page).

I do not think that '... mass-market switch to the ISO 20022 standard for payments ...' is supposed to suggest that Switzerland will develop specific national ISO 20022 compliant messages to be used for payments.

I do suggest to Finextra that texts referring to 'ISO 20022' be unambiguously formulated to help prevent further confusion on this topic