You say that “Spatial curvature” is nonsense, but you accept that a plane is flat. Therefore you accept that non flat plane like entities exist. In fact if the sum of a triangle angles is not equal to a straight line (180°) if the triangle is in a non flat “plane”.

If a plane 2D like entity can be curved, why do you tag as nonsense a non flat hyperplane (a plane with N spacial dimentions)?

Anyway, study a bit of mathematics and you will find out that space can be curved.

Let’s go on:

Nothingness and space are two different concepts, you confuse them.

You imagine the universe as a big cartesian 3D plane, with a clock ticking inside. That’s proven wrong. The predictions of the influence of gravity and speed on the space-time curvature has been tested. In particular simultaneous events are relative to the observer and they do not exists ontologically.

the “fabric of spacetime”… a non-entity made famous by general relativity, the infallible truth about the universe (according to Ethan.)

Actually you are writing about “infallible truth” stating nonsenses and ontological truths regarding the “the real world of nature.”

If I am not wrong, Ethan just says that inflation theory makes some statements and, up to now, they passed the verification phase of science. He also concludes that if something will be falsified, things will get even more interesting…

If you don’t understand something, it doesn’t mean it is wrong…