And still not the tangible proof. Correlation is not causation. Because this is the sort of thing that happens in retail all the time.
I'm usually on board with the "correlation does not equal causation" argument unless proven otherwise.
Case in point at the pet supermarket I used to work at. Customer came in complaining we don't have X brand of dog food they want. Pet supermarket already had plans to add that to the store inventory long before. But since they were a customer I was required as all jobs that sell any sort of product requires me to kiss the customer's ass. So I would state they are correct we should carry it because it is such a good brand and that pet supermarket is working on adding that food to our store some time in the future.
You know what I said to myself when I posted the link and the dates? I said, "Self, he's going to find some convoluted reasoning why he thinks this won't be true, and he'll do so in too many paragraphs and with a weird analogy." I was right!
Which if you will note is a different thing but follows the exact same line as that apology you are mentioning. When I asked for tangible proof I wanted some blog, interview or something were someone working on the game directly states they were not rushed to finish the game, that the original ending was perfectly ok and that they only created the EC because people were complaining.

The **** do you think you just read? Do you have any idea how business works? No one's going to come out and say, "Ooops, sorry. We'll fix it." Because that's a bad business decision. What you're looking for are internal emails and documents from Bioware with subject lines screaming, "HOW DO WE FIX THIS?!" and sorry, I left those in my other pants. I know Patrick Weekes has said quite a lot. I know that Mac and Casey were the ones who wrote the ending almost entirely by themselves. (Someone correct me if I'm wrong on that, but I think they did it without any assistance from the rest of the writers.) You'll have to use your brain in this case and come to the correct conclusion.
I'd hesitate to call it an "apology" save in a backhanded manner, like "We're sorry you're too dumb to understand our Art"
Yeah, I know. I just remembered that it had been released and when you google "Bioware apology" that's what you get. 