Of course coastal erosion has been going on for centuries (or, indeed, millennia), Dave50, but the important fact is that climate change is vastly accelerating the process through rising sea levels.
The BBC has correctly reported on the findings of Dr Komali Kantamanemi (Senior Research Fellow, University of Central Lancashire), Dr Louis Rice (Associate Professor of Architecture at UWE Bristol and Head of the World Health Organisation Collaborating Centre for Healthy Urban Environments), Dr Xiaoping Du (RADI, Chinese Academy of Sciences), Dr Belqais Allali (University of Salford) and Dr Komali Yenneti (University of Wolverhampton).
Their research seems to have taken quite some time to get noticed by the BBC though, as it was published in 'Coastal Management' back in January. That journal is internationally respected and everything in it has been fully subjected to peer review prior to publication.
I see nothing wrong at all in the BBC correctly reporting on the findings of work by internationally-respected experts in their field, which has then been further checked by others independently.
https://www.tandfonline.com/doi/full/10.1080/08920753.2022.2022971