https://www.holmenpaper.com/en/sustainability/sustainability-stories/five-myths/all-paper-can-be-manufactured-from-recovered-fibre/

Admittedly, 69 per cent of all paper and paperboard consumed in Europe is reused. But this is not sufficient to secure the supply of raw material. A paper fibre can be used 5–7 times before it is used as biofuel. For this reason, virgin fibre is necessary to guarantee the supply of paper and achieve grades that cannot be manufactured from recovered fibre.