Take stories like this with a grain of salt.
As a Norwegian interested in the economy, finance, stocks and industry I have not heard about it so I made this query
fosfor stavanger OR rogaland
This 2024 story from our state tv station NRK may be the source (I assume that you can use a translation service)
https://www.nrk.no/rogaland/mineraler-u ... 1.16766034
But a related story from the same tv station published in september 2020
https://www.nrk.no/rogaland/mineraler-f ... 1.15133192
has not drawn my attention, and I have not read about it in the media.