I imagine they are just quoting from a briefing from Braverman and/or the Home Office. I have read much the same elsewhere but cannot find the link right now.

The Independent did add the following to the piece you quoted.

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This article was amended on March 20 2023. The headline originally referred to ‘EU judges’ but the ECHR is not an EU institution.
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Of course we will have to wait and see what happens.