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It might seem strange for the company to be doing this at this moment, when they are embarking on the construction of the very ambitious Super Heavy and Starship rockets. One would think they would need to expand (not shrink) their workforce to make that happen.
What I see is that they have recognized a need to reconfigure their workforce. This article today about their growing fleet of Falcon 9 first stage boosters, provides the clue.
SpaceX’s reusable Falcon fleet could feature as many as 12-15 boosters capable of something like 5-10 additional launches each by the second half of fourth quarter of 2019. At that point, SpaceX might have enough experience with Block 5 and enough flight-proven boosters to plausibly begin a revolutionary shift in how commercial launches are done. With far more boosters available than SpaceX has payloads to launch, multiple flight-ready Block 5 rockets will inevitably stack up at or around the company’s three launch pads and surrounding integration and refurbishment facilities.
In other words, they no longer need as many people employed building expendable first stages. Moreover, they might have found that many of the employees used to build new Falcon 9 first stages are not the kind they need to design and build the new rocket. This trimming allows them to cut some fat with the opportunity to add muscle later. It would not surprise me if their workforce once again starts to grow, but with new employees with new skills.