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It has a chat feature. In the same way your employer could look through your email or your contributions to your intranet because they own it, they* - in theory - could look through content written in the chat feature.
In a nut shell: it's moderated.
It doesn't provide access to the handset's other messaging capability if that's what you are asking.
* NHS Business Services Authority
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https://www.theregister.co.uk/2020/05/14/nhs_contact_tracing_app/
usually theReg is the best source for IT news. It does not address this specifically but the data protection is not great atm.
Is any of this true? I don't know anything about the app, so can only go on what the article says. It would be interesting to hear comments from any approgrammers on here.
https://www.theguardian.com/society/2020/may/15/union-warns-care-workers-not-to-use-uk-government-covid-19-app