A complexity here is that Switzerland is a small country heavily integrated with the Eurozone, but with its own currency that has recently risen strongly in value. In CHF terms, yes, Swiss prices are currently deflating. But this isn't really a domestic deflation phenomenon in the sense that a similar decline in prices would be in a bigger economy like the USA: the role of CHF in Switzerland isn't nearly as canonical/exclusive as the role of USD in the USA, since so much Swiss business, even individual business, takes place in EUR-priced marketplaces.

As the article briefly mentions, the Swiss Franc is now worth about 10% more vis-a-vis the Euro than it was a year ago. Many things in Switzerland are actually inflating if you care about EUR value, which many Swiss people and businesses do: prices and wages have decreased 2% in nominal CHF values, while the CHF has simultaneously appreciated 10%. Many Swiss employees therefore in practice have a salary that represents more European buying power than it did a year ago. That could be expected to have some effects more similar to inflation rather than deflation, in this context.

I think the same would probably happen with any small European country. If Denmark broke the DKK/EUR peg and let the DKK appreciate by ~10%, many things would deflate in DKK terms to compensate.