[xelxebar]

To play the Devil's advocate a bit, I feel like your comment is just arguing about definitions.

Cosmological models of the early universe tend to naturally break up into several phases, e.g. the inflation period, baryogenesis, and (much later) nucleosynthesis.

Given how sketchy our data gets the further back we try to probe, it's certainly not unreasonable to say that "Big Bang" refers to the point at which inflation ended.

Heck, even inflation itself is something that's hotly debated, and the search for evidence of an iflation field is an extremely active area of reseach.

> According to the current understanding...

Feel like you've been misled. What you describe there is a summary of an idea for a model that is particularly beautiful mathematically.

Once we have a solid, evidence-backed model going back so far, I suspect the Quantum Gravity nut will have already been cracked for some time.