Good question.

And let's not forget that little Black Swan pandemic which froze the world and our negotiations for over a year while we were sucking on government teet.

One side of the table would state: "Well, if you had agreed to our ask in 2019 we would have had a deal. Therefore we should be receiving retro."

The other side of the table would state: "Well, your ask was so astronomical there was no way we could agree to it, so why should you be receiving retro?"

So now, the pertinent question is: "How close is this TA to our ask?"