It is harder to take seriously people who think the "Septuagint" (or the "LXX" as it's called) was really compiled and translated by "72 Israelite scholars" 6 each from the "12 tribes," in 250BC than it is to take seriously those who accept the "Dead Sea Scrolls" as authoritative.

It was a creation of the apostate Origen, in the second century AD, filled with errors, contains later apocryphal works, and was used to justify heresies of gnostics in the early Roman Catholic cult.

Jesus cited the OT scripture, compiled in Hebrew by scribes of Levites, that He Himself had inspired. With jots and tittles.

The "Letter of Aristeas" that supposedly commissioned this work, appears to have been a forgery written by the Alexandrian apostate Jew, Philo, in the first century AD, to justify his heresies. The "12 tribes" did not exist in 250BC, and there were no scribes in among the long scattered and destroyed 10 tribes of the Northern Kingdom. There is no evidence of the existence of a Greek translation, other than a copy of Deuteronomy 23-28, with zero indication that it was from a larger work, and dated to 150BC, a century later than the supposed Septuagint.

When people today talk about the LXX they are not referring to a translation from 250BC, but are entirely talking about the second column of Origen's Hexapia, where his own translation was recorded.