Are Feldbrugge, Lehners, and Turok wrong about their paper?

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41%

Jean-Luc Lehners publicly admits that the claim is problematic.

41%

Neil Turok publicly publicly admits that the claim is problematic.

41%

Ding Jia (question creator) publicly admits that his own criticism is problematic.

34%

Job Feldbrugge publicly admits that the claim is problematic.

In their influential paper "Lorentzian quantum cosmology" (https://arxiv.org/abs/1703.02076 ) physicists Feldbrugge, Lehners and Turok claim that they were studying a "Lorentzian path integral, defined as a functional integral over real Lorentzian metrics."

I think this claim is wrong, for reasons summarized in this youtube video: https://youtu.be/jUmJcYbMZJ4

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