You could be right, but there is language in the 8-K that could be read otherwise. I'll quote it all for context and highlight the relevant portion which explicitly says that the Grohmann equipment will have a "ramp" in Q2. So that could mean that the equipment was tested in Germany and working fine, but they did not go through all of the optimization necessary to ramp it up to its full capacity.
Tesla, Inc. is clarifying the following statement made by Elon Musk, Tesla’s Chief Executive Officer, during Tesla’s fourth quarter and full year 2017 financial results conference call held on February 7, 2018:
“[We] expect the new automated lines to arrive next month in March. And then it's already working in Germany so that’s going to be disassembled, brought out to the Gigafactory and reassembled and then go into operation at the Gigafactory. It's not a question whether it works or not. It's just a question of disassembly, transport and reassembly. So we expect to alleviate that constraint. With alleviating that constraint, that's what gets us to the roughly 2,000 to 2,500 unit per week production rate.”
The “2,000 to 2,500” units per week cited in this comment refers solely to the capacity of the additional automated battery module manufacturing equipment that is currently located in Germany, and not to Tesla’s total Model 3 production run rate or to the capacity of the automated battery module equipment that is already present at Gigafactory 1. Tesla’s ability to meet its target of 2,500 per week by end of Q1 2018 is not dependent on the additional equipment that is currently located in Germany, as that equipment is expected to start ramping production during Q2 2018. With respect to battery module production, Tesla’s ability to meet its target of 2,500 per week by end of Q1 2018 is dependent only on the equipment that is already present at Gigafactory 1, as well as the incremental capacity that is currently being added through the semi-automated lines that were also discussed during the conference call.
Referring to the Grohmann equipment's "capacity" and stating that the equipment was "already working" in Germany does not necessarily mean it has been fully optimized in Germany and is already working at
full capacity. And given the "ramp" language, I am cautious about concluding Tesla will basically assemble the line, flip a switch and the line will be running full tilt.
I will freely admit I could be overreading this but especially given the explicit "ramp" language in the 8-K prefer to err on the side of caution.
Either way, the result could be essentially as you describe since the "ramp" of the Grohmann module manufacturing equipment could be straightforward and relatively quick once the equipment is installed.