Only a reductio ad absurdum. The Texas Sharpshooter Utility Function is completely useless, and is not a utility function.
It is useless, because it makes no predictions. It does not constrain your expectations in any way.
It is not a utility function in the sense of the Utility Theorem, because utility functions in that sense are defined not over outcomes but over lotteries of outcomes. Extending a TSUF to lotteries by linear interpolation does not work, since lotteries can themselves be conducted in the real world, and all real occurrences of such lotteries are given a value of 0 or 1 by the TSUF.
Utility theory therefore does not apply to the TSUF. Calling it a utility function does not make it one.
It is like defining a universal theory of physics by assigning "true" to whatever happens and "false" to whatever does not.
The Texas Sharpshooter Utility Function is completely useless.
It wasn't an example I gave. I care almost nothing about Straw Texas Sharpshooters.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.