This is the failing X86 based server business (STG) which IBM has sold off to Lenovo, most likely duplicate test/support staff which Lenovo already have. They aren't just trimming - the departments are closing down.
Systems and Technology Group is the hardware wing and within contains X-Series Division. IBM is keeping the other power, storage and Z (mainframe) IIRC.
You're forgetting about networking and the STG software divisions (e.g. firmware, some cloud software, the products that they acquired when they bought Platform Computing..)
> "Announced today including managers"
This is the failing X86 based server business (STG) which IBM has sold off to Lenovo, most likely duplicate test/support staff which Lenovo already have. They aren't just trimming - the departments are closing down.