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As per the environmental ratings on the 54907 datasheet (Table number 16 on Revision C and Table number 17 on Revision J), -30 to +85 ℃ is the Ambient Temperature in which the device was operational/functional.
Which means, the CYW54907 Eval Kit can work between -30 to +85℃
As per your question "Can it work in -30 to 70 centigrade?"
the answer is YES the 54907 Eval Kit will work in that temperature range.