Your skepticism is quite justified regarding hardcore formulations 11-oxo.
I have used 11-oxo in the past with great results. Then recently tried hardcore formulations....
after a couple of days got i terrible joints, felt awful. Turns out that the product is full of armistane. Yet they don't advertise this.
So beware.... it may have a fairy dusting of 11 oxo in it but who knows, but from my reaction suspect it is 90% arimastane