Earlier quoted context omitted.
Unfortunately Boeing has petitioned for, and received amendments to its “fixed-price” contract to cover these extra costs in the past. Boeing making this number public, which they would have every reason to keep secret for competitive reasons if it was their own cost, is the first step in normalizing the customer to the added cost. Watch as they threaten to pull out as they have done before...
Is that really a priori the wrong way to run things? You have a project, you estimate the cost, you have a contract, then the customer just HAS to add more stuff, so you negotiate about what to add at what cost in time and money. So, fixed price with adjustments, why wouldn't that be normal (in a vacuum)?
Yet Boeing has shown consistently that they are only able to operate in the old business model where "profits" disappear into "overhead" and contracts earn only a small margin of profit. Then as something unforeseen happens, as has happened multiple times, they threaten to pull out and force a renegotiation.
This defeats the entire spirit of the fixed-price contract, and costs the taxpayer. IMHO NASA contract officers should call the bluff, and give the contract to Sierra Nevada if Boeing does back out.