I'm still waiting for someone to post their service center slip to replace the glass.
I would be totally shocked if Tesla admitted fault on something that is not faulty. This would cost hundreds of thousands of dollars in labor and product.
That's the thing... we still don't know if it is or is not faulty. It's certainly possible that a batch of glass escaped the factory without the proper coating. It's possible that Tesla knows this and to keep production up is shipping it anyway and figures X% won't notice or won't care and they can replace the glass for the customers that do later. It's possible that Tesla intentionally removed this coating, either switching to something that looks different but works the same or just removing some IR protection.
If, in a week or two, we stop seeing new cars without the red on the rear glass, I'd be inclined to say the glass without it was an error. And yes, I probably would have the glass swapped in that case. (assuming my car doesn't have it; I'll find out next week)
On the other hand, if the missing red is ongoing, I think it's likely that Tesla intentionally removed it. Hopefully making up the IR protection elsewhere, but either way, I'd agree that it isn't a fault. Or, at least, isn't one that will be fixed by getting the glass swapped unless there's a SC out there with some old stock glass.
Unless Tesla comes out and says "we meant to do that" like after the headliner bit... we're just going to be guessing based on what comes out of the factory. And I haven't seen that statement. I've seen statements from service center employees, but like any large company, they don't always have all the information and aren't always willing to admit it. I want something from PR. Or Musk, I suppose.