You miss the point. It is the use of certain distasteful allusions and metaphors that is inappropriate. And that you actually quote it.
I find Triana's metaphor "Virgins teaching sex" both appropriate and expressive.
IMO a professor, who never traded a bond, does not know which stocks DAX / DJ30 consist of and never tried to calculate optimal Markowitz portfolio
in practice cannot write a books for professionals.
In no way I mean that such professors are useless because very few practitioners (if at all) can be successful without possessing at least the basics of theory (which one learns being a student).
However, in Triana's terms, too many professors pose as sex experts (instead of admitting that though they read a lot about sex, they are still virgins).
I even know two, who proudly(!!!) chat that they ignominiously failed when tried to manage a hedge fund.
That's why I find Triana's attitude quite appropriate.
(By the way, contrary to Germans, the American professors are much less arrogant and more willing to interact with practitioners, but once again, it is my personal experience).
I suppose it is one way to get attention.
I agree. But why not? I think he made a good money with his book and got a fame (though a little bit scandalous but who cares).
As to the fact that he got off radar, well yes, but quants are nowadays are also quite off-radar
(IMO the place of quants/financial mathematics is being occupied by data analyst/big data, s.
https://www.quantnet.com/threads/2015-quant-job-market-cds-is-dead-booming-data-analytics.20245/)