The source mentions that the launch is "imminent" and only a few weeks away which jibes with Elon Musk's "end of Q3" Cybertruck release date promise back in April. There are a few other signs that point towards a Cybertruck launch in September, too.

For one, Tesla has been filmed loading multiple units on trailers and shipping them out of Giga Texas just this past week alone, as the parking lot there seemingly gets new production batches every few days. They seem heading to the Fremont factory while some stop for crash tests on the way.

Moreover, Tesla has reportedly been filming what could turn out to be the first Cybertruck launch ad up in the glaciers of Iceland. Locals have taped the Cybertruck surrounded by camera equipment there, or doing laps on the glacier fronted by a black Land Rover with its tailgate open as if for capturing footage.

Eoin Treacy's view

It is quite likely the Cybertruck units being loaded onto trailers are for crash tests. That suggests the final design is confirmed and Tesla is ready to begin ramping up production. There is clear potential the Cybertruck has cannibalized some demand for Tesla’s other models, as well as successfully attracting new adherents to the brand. If that assumption is correct, sales should surprise on the upside in the coming quarters.
The share is currently firming from the region of the trend mean and a sustained move below $200 would be required to check potential for additional upside.

Meanwhile GM has had to shelve half its autonomous fleet in San Francisco following several high profile accidents. That’s not great news as the company faces significant negotiations around pay and benefits. The share is currently holding at the lower side of the range but needs a bullish catalyst to provide a reason to confirm the return of demand dominance.
Ford is also trading back in the region of its recent lows. The question of cannibalization of demand is potentially dire for both companies as new entrants to the pickup truck sector evolve.