This is Latin, literally: “as if a dead body”, meaning the total emptying of the self/ego, to make room for total obedience to the church
It’s a motto principally applied to the creation of a centralized organization like the Catholic Church, where the Jesuits practiced total self-denial, the willful hallowing out of the ego so as to make room for the total submission to the Pope and those at the top of the ecumenical food chain.
Once you grasp the application of this motto to the Catholic Church, you can see how it is a project fraught with complications because self-denial is counterfeiting on a grand scale.
Counterfeiting is a Beaudrillard, Jean term. He talks about this human tendency to replace a natural thing with an artificially constructed one: “…the demiurgic ambition to exorcise the natural substance of a thing in order to substitute a synthetic one.”
Cross reference “perinde ac cadaver” with the act disembedding. Is the latter term a manifestation of the former?