Deryk Barker responded to me:

>>Does anyone know anything about this. Supposedly it was discovered last
>>year in Mengelberg's apartment last March and completed? compiled? by
>>Cooke. Is this a joke?
>
>Given that Cooke died in 1976.

Good point!

Looking at the article I was also taken back by the meter of the example
16/32.

I should have known better

Karl