Andrew - I can see from all these comments how refined and subtle this issue is.
I wonder though why it is that Paul sometimes says Christ Jesus, and sometimes Jesus Christ, and sometimes the Spirit of Christ, sometimes just Christ, maybe even just Jesus - and so on. Is there not some recognition of the true humanity of Jesus and the true divinity of the Anointing - even though they are conjoined twins in this case? I am sure I might have lost my head for such a question at various times, but… is it a question worth following or should I get out my catechism and do a better job at memorizing the answers (not to mention keeping the rules)?
I read recently a suggestion that Jesus = YHWH. I don’t think Paul ever makes this direct identification. Our Bibles have confused us all with the Adonai / Hashem / LORD conventions.
The Jewish Annotated NT has no note on this verse. The Joel text is בְּשֵׁ֥ם יְהוָ֖ה - but not the LXX - how curious and how confusing.