I couldn’t immediately see a link to the actual EU archive in that article, for reference I think it is this one : https://wayback.archive-it.org/11980/20200131192225/https://blogs.ec.europa.eu/ECintheUK/euromyths-a-z-index/

Copper will still be used, its just the traditional analogue phone signal delivered over the copper that is stopping. New (and changed/upgraded) users will instead receive a digital phone service, effectively over broadband (which can still be delivered over copper lines).