That must be one of the silliest hacks I've ever heard, right up there with oven-baking electronics to fix loose solder joints. I love it!
What freezing the drive may achieve is either un-sticking it from the bearings (see also the "bang drive on edge" technique), or lowering the thermal noise floor in the electronics enough for marginal components to make it through the boot sequence.
It's not recommended. https://www.gillware.com/blog/data-recovery/hard-drive-freez...