Their "admission" is biased to their underlying theology. It has to read that way for them, for "trinitarianism" or "unitarianism", thus arianism, to be true. Yet, the actual translation or original, cannot read that way, for the scripture teaches none of those things, but it does teach the eternal Heavenly Trio, which those other theologies cannot abide.Quoted From Ps. 45
In addition to these admissions by trinitarian translators concerning Heb. 1:8, we need to look back at the Old Testament Hebrew scripture (Ps. 45:6) that Paul was quoting when he wrote Heb. 1:8.
The RSV renders Ps. 45:6 as “Your Divine throne” and a footnote provides this alternate
reading: “Or ‘your throne is a throne of God.’”
The NRSV says in a footnote: “Or ‘your throne is a throne of God.’”
The NEB says: “Your throne is like God’s throne.”
The Holy Scriptures (JPS version) says: “Thy throne given of God.”
The Bible in Living English (Byington) says: “God is your throne.”
New International Reader’s Version (NIRV): “Your throne is the very throne of God.”
The Good News Bible (GNB), a very trinitarian paraphrase Bible, renders it: “The kingdom
that God has given you will last forever and ever.”
The REB has: “God has enthroned you for all eternity.”
The NJB gives us: “your throne is from God.”
Leeser - “Thy throne, given of God, endureth for ever”
We also see the following statement by respected trinitarian scholars in a footnote for this passage:
“45:6 O God. Possibly the king’s throne is called God’s throne because he is God’s appointed regent. But it is also possible that the king himself is addressed as ‘god.’” - Ps. 45:6 f.n. in the NIV Study Bible (1985).
In addition to the above renderings by many respected translators (most of whom are trinitarian), we have the statement by perhaps the greatest scholar of Biblical Hebrew of all time, H. F. W. Gesenius. In his famous and highly respected Hebrew and Chaldee Lexicon to the Old Testament Gesenius renders Ps. 45:6, “thy throne shall be a divine throne.”
Just the admission by so many trinitarian translators (above) that Heb. 1:8 may be honestly translated in a non-trinitarian manner makes any insistence by other trinitarians that this scripture is acceptable evidence for a trinity doctrine completely invalid!
The 'Bibles' (counterfeits) you have cited (all after 1881, when Westcott and Hort brought in counterfeit texts/mss/codice) are primarily based in Aleph (Sinaticus) and B (Vaticanus) or even A (Alexandrinus), corrupt mss, that are inherently arian in nature. As I said before, "trinitarianism" and "unitariansim" share that same base of arianism, of 'singular principality'. The translation committees all have had Jesuits on their boards, whether of the UBS, or Novum Testamentum Graece 28th [Eberhard Nestle's / Kurt Aland's, etc] (aka N/A) , which is why the NWT of the WTS, follows the Aleph and B texts also (demonstrable upon request).
This is why I ask you (or anyone) for:
"Finally, looking at this historically (meaning across time), can you cite one Jewish commentator (such as a Rabbi, the Talmud, Mishna, etc) or ECF (so called Early church fathers, I'll even accept an Arian 'father'), Lectionary, etc before 1700 that renders the passage as "God is your throne"?, rather than "thy throne O God is forever and ever"?"