I don't buy that number (no source is attributed to it), or rather, I don't believe there's a single incident causing this.
The C-Lion1 cable is predominantly North-East - South-West whereas the BCS cable is NW-SE. They do meet, but the C-Lion1 operator Cinia says their cable broke about 700 km from Helsinki, east of the southern tip of the Öland island. That's easily over 150 km south from where the cables meet.
Also, C-Lion1 was reported broken at 4m, and the BCS cable at 10am the previous day.
The C-Lion1 cable is predominantly North-East - South-West whereas the BCS cable is NW-SE. They do meet, but the C-Lion1 operator Cinia says their cable broke about 700 km from Helsinki, east of the southern tip of the Öland island. That's easily over 150 km south from where the cables meet.
Also, C-Lion1 was reported broken at 4m, and the BCS cable at 10am the previous day.