I thought about the same device. In this thread [0] they say the additional height above the drive is 0.75mm. According to amazon the height of the XPG is 0.35 cm (3.5 mm). The height of the SN850 is 0.24 cm (2.4mm).
2.4 mm + 0.75 mm = 3.15 mm, which is smaller than the 3.5mm of the XPG.
Even if it would fit, I can imaging the heatspreader would more prevent the airflow instead of really help.
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