Job Feldbrugge publicly admits that the claim is problematic.

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

Neil Turok publicly publicly admits that the claim is problematic.

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

Jean-Luc Lehners quits academia for more than five years.

In their influential paper "Lorentzian quantum cosmology" (

 ) 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: 

This market is for proposition bets regarding this issue.

https://manifold.markets/ttoe/is-david-wallace-wrong-about-decohe

https://manifold.markets/ttoe/are-rovelli-and-vidotto-wrong-about