Layla4,

Ms. Lui was not suggesting that the examples she cited prove that senior managers tend 

1. to appoint women to management roles (and taken kudos for having so done) in cases where, through no fault of the appointee, these newly minted managers will fail and thereby take the rap (and deflect the blame from the senior managers) for a project that the senior managers knew was likely to fail, and
2. to implicitly draw attention to women associated with a difficult situation that occurred under the watch of the senior managers as a means of deflecting some or all of the blame for the situation occurring.

Rather, Ms. Lui is taking points 1 & 2 above as givens and simply:
1. drawing attention to practices currently too prevalent amongst senior managers in both the private and public sector, and
2. pointing our that Justin Trudeau had arguably indulged in those practices.