This is all moot if Pedro made it up, but if he didn't, then this is what I see:
What's Pedro's point of view? Here's some:
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"My source on the line emailed me last night."
That's what I thought: it's from someone working there. The worker only sees the physics and mechanics of the speed of installing a new line and the speed at which it operates. The worker does NOT see the manufacturing of the new line AND the cost to engineer, order, build, and install it. So, the worker looks at the line and calculates in their head extrapolating from a time and space of their own witness, but doesn't take into account the loans and factory equipment manufacturing necessary to bring that about. That worker sees a pathway on the basis of what is presented to them, but not based on the entire corporate system.
What that means to me is that the worker, who is probably slightly optimistic since they have an interest in working on that thing and think of it naturally, and often doesn't naturally consider the amount of time they have off or are not working on it, has viewed what is possible for the equipment systems, as it can be installed over the next few seasons. Since there is a push to actually build a higher rate of cars, we'll see some amount of that possibility, but it has to fit into the realities of getting and installing that factory equipment and calibrating it for production.
The tent thing tells me they are agile enough to do stuff like copy paste without senseless nitty excuses of why they "can't" copy-paste factory lines. That, however, does not mean they'll actually DO that. For instance, I've heard one prediction that the tented line is for experiments; I suspect that's not quite right, but readers here probably know better than I now.
So, 10,000 by February? Only if the lead time for factory installation fits in that window from the time they ordered that equipment and if it's compatible with that outcome (what if the tented line is an older version that works right and the new equipment is a newer version that doesn't work right? Unlikely, but possible), AND if they actually get to 5,000 within the next 2 months. Since that's everything they're trying to do, I suppose it is reasonable to think it is POSSIBLE, but it should be tempered from my point of view because of the factory worker's point of view being too close to it.
Wildcards could be different speeds of different factory engineering.