They are totally separate the Wiz thing is a reverse IDF merger.
The SB purchase is part of Arm completely restructuring their IP philosophy and business model. Ampere was sold for "so little" because Arm could effectively just cut them off as soon as their contract ran out. This was a cleaner transfer.
Arm is bringing everything back in house, ceding the low end to RISC-V and taking the high end back in and producing their own silicon.
The SB purchase is part of Arm completely restructuring their IP philosophy and business model. Ampere was sold for "so little" because Arm could effectively just cut them off as soon as their contract ran out. This was a cleaner transfer.
Arm is bringing everything back in house, ceding the low end to RISC-V and taking the high end back in and producing their own silicon.