aren't willing to make that claim

Simply untrue; see, e.g., this article. What's the source of your information about this? (You should maybe trust it less.)

[EDITED to add: Hello, downvoter(s)! If it happens that you are downvoting me for something actually wrong with what I wrote, do please let me know what. My current hypothesis is that I'm just paying the disagreeing-with-Eugine/Azathoth/VoiceOfRa tax, though.]