Learn Swedish: Vaccinet påstås innehålla ett hemligt chip. - The vaccine is claimed to contain a secret microchip.

This is the core of this lesson! Passive verbs of reporting like påstås (is claimed), sägs (is said), and anses (is considered) take a bare infinitive. You simply link them directly to the next verb without the infinitive marker att.

Is påstås an s-passive or a deponent verb?

It is an s-passive. The base active verb is påstå (to claim), so påstås means 'is claimed.' A deponent verb ends in -s but has an active meaning, like minnas (to remember). Here, an unnamed party is doing the claiming, making it a true passive.

How does the prefix inne- change the verb hålla here?

The verb hålla means 'to hold.' Adding the prefix inne- (inside or within) turns it into innehålla, literally meaning 'to hold inside.' This is the direct Swedish equivalent of the English word 'contain.'

Why is it ett chip? Does this word also mean potato chip in Swedish?

A microchip or casino chip is ett chip. Because it is a neuter noun, the adjective hemlig (secret) takes a -t ending to become hemligt. A potato chip, however, is called ett chips, which confusingly borrows the English plural 's' right into the singular Swedish form!