I don't know about “McKinsey infiltration into many a large F100+” first-hand, but from context I'd guess it's simply getting consultants from McKinsey & Company[0] jobs in the ‘infiltrated’ firm, on the basis that it has no in-house employees capable of properly setting up / running the bizarrely complex and idiosyncratic SCM-ERP-HCM-BI-etc. software in question.

Basically: You have a problem; Oracle/SAP says they'll solve it for you. Now you have a second problem; they say McKinsey'll solve it for you. Now you have …

[0] https://mckinsey.com

Its the cancer that permeates your C-Suite. Meta-stasize-ing,

God I love etymology:

"-Stasize"

     **To stand on a hilltop once. To be, this time, on advance. To reach the highest clouds. To touch the limits of space. To out-grow skyscrapers. And make them look at my face.**

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So FB is becoming a meta-stacious being..

That which wishes to control from a vantage, or t corrupt from within the minds... The light house.