Do we still 3barrel this hand today?

Yes but his sizing is atrocious

What are better bet sizings? What are standard cbet sizings nowadays 1/2, 2/3?
Turn?

I like this with the As, without it I don't.

I was gonna ask if you printed out the hh in colour and then faxed it into 2p2 before i saw it was from a book

As above, turn sizing is bad. Betting geometric (ie giving opponent same odds on turn as the river allin) is the way to go. My brain isn't braining enough to work out how to work out the maths behind it but it looks line ~70 ott and then the rest otr gives about the same odds. Doesn't need to be exact

Guess I’m a little confused by thread title. I don’t know exactly when first hand of PLO was dealt but if it was 1983 then the exact moment the dealer starting pitching the cards a set of GTO solutions were birthed into the universe. And they are exactly the same as they are today.

If it was correct in 1983 or 2007 then it would be correct in 2025. But something being in print doesn’t mean ot was correct.