I don't know if they released the details on the bullet. Like would a hollow point be stopped by a neck bone? I don't own any 30-06 or 7.62; so I'm uneducated on the subject as I haven't ever looked into this.
What I have looked into is AR500 armor (AR500 steel) and how it can take 70+ rounds of 7.62/30-06 and no problem. But a single .223 round going 3000 fps will penetrate it. "Speed kills" is the saying. There are youtube vids confirming.
At the time of me looking into this, AR500 Armor Systems (the company) stated that it (AR500 plate) can stop .223/556 rounds. But youtube disproved it and they changed their story that you now need lvl III+ to stop 223 rounds which is their AR550 steel.
To stop a rifle round (based on NIJ rating), you have to have either AR500 steel, ceramic or composite plates. No soft armor exists with the expectation of being capable of stopping rifle rounds by itself.
According to video analysis by several people posting online, there's no one who believes he was wearing a plate carrier. IF he had anything at all, it was soft material that would only be rated to stop handgun rounds. A Level IV ceramic plate would need to be about 1" thick to stop a 30-06 round -- plus the thickness of the plate carrier. This would be hard to hide under a t-shirt.
NIJ Level III (NIJ RF1) is rated to stop:
7.62x51mm M80 Ball NATO FMJ Steel Jacket 149 +0/-3 grain round,
7.62x39mm MSC Ball Ammunition Type 56 from Factory 31 round, and
5.56mm M193 56 +0/-2 grain round.
NIJ Level IV (NIJ RF3) is rated to stop:
30.06 M2
AP*165.7 +0/-7 grain round
*("AP" == "Armor Piercing").
None of that matters if the bullet impacted above the plate carrier -- neck or cranium.
Level III+ isn't an official label from NIJ. They call it NIJ RF2, with RF1 being Level III and RF3 being Level IV. I guess it's too much to ask for the numbers to align! RF means 'Rifle'. The handgun-rated levels are designated HG1 and HG2 (Level II and Level IIA respectively).
Level I armor is no longer part of the NIJ standard, which was only rated for .22LR and .380ACP rounds. The lowest NIJ rating is Level II.
https://nij.ojp.gov/topics/equipment-and-technology/specification-nij-ballistic-protection-levels-and-associated-test-threats-nij-standard-012300