One can achieve very good results using the home freezer, obviously much higher temperature than real -300F cryo. Having done both I’d opine home freezer results are comparable to -300F cryo. Results of real cryo depend on variables like ramp up and down times, dwell time.
Home freezer - 48 hours in the freezer, remove place in regular section of refrigerator for 4 hrs to thaw gradually. Remove and allow to reach room temp, then repeat process for another 48 hrs. CDS, cables, portable players, batteries, LPs, the sky’s the limit.