That the Septuagint was a commonly used Greek translation of books is undeniable. That Jesus or the Jews accepted all of it as scripture is deniable, because they didn’t.
They used to sell Bibles that included the Book of Common Prayer, but that didn’t make the latter scripture.
Wasn’t us who sold them with the common prayer, sir. You might want to talk to the Anglicans as to why ‘scripture alone’, apparently involves attaching the common prayer.