Summary: POSCO was cheated. They want to try again this time with someone they can trust.
The link below is google's cache of a bloomberg article. You won't be able to read it directly at bloomberg, so you have to read it from google's cache:
https://webcache.googleusercontent....ong &cd=4&hl=en&ct=clnk&gl=au
Only reason I found the above was from the PDF:
https://www.minem.gob.ar/servicios/archivos/7674/AS_15115524941.pdf
Page 12 says "POSCO terminated the agreement with LineA inc prior to the acquisition of LineA's assets by LCS Lithium Corp acquired by LitheA in June 2017.