It's all pretty well documented in a wide variety of sources, but if you want the definite read check out "Countdown to Zero Day" by Kim Zetter. Lots of technical information about how Stuxnet/Olympic Games actually worked. A good book as well.

I think they are questioning the “self-destruct” claim.

My understanding is that the aim was to have the centrifuges return erroneous information rather than obvious sabotage like self destruction.

Wasn't the idea that the centrifuge would spin in a way that causes premature failure, but the controller display would instead show it spinning at the correct speed? Depending on how you interpret the meaning of the word "erroneous" this could align with what you're saying.

The devices controlling the centrifuges would return erroneous information (that everything was fine) while causing the centrifuges to self destruct. So it would appear everything was working properly and the centrifuges were just failing for unknown reasons, which would cause the workers at the enrichment facilities to draw the wrong conclusions about the source of the problem.

Does the book talk about how the centrifuges are from Siemens and that Siemens still has offices in Iran?