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FWIW, in my US English dialect, tariff is a synonym for "import tax". So for me, there isn't really any other sensible interpretation for the headline.

That's redundant; a tariff (in the sense normally used in modern English; there are other meanings but they'll generally be clear from context) is a tax on imports.

Tariffs are defined as taxes levied on imported goods. There isn't any other possible interpretation, so it's not misleading unless you don't understand the concept of tariffs at all.

Not necessarily related to this but this applies to USA definition

Outside of USA the word tariffs does means prices. You internet provider will give you list of tariffs .. which plan you wish to realise -- your hosting plans page will be titled Tariffs often not Pricing or Plans

That won't be expressed as a percentage, though; the difference should be clear from context.