Charging a device with higher amperage, can somebody please clear up the confusion and contradictory statements?
From what I can gather, the Samsung’s Adaptive Fast Charging is a sort of Quick Charge 2.0, and therefore requires a QC-type "negotiation" to output potentially damaging 9-V charging level. In default mode it will serve as a regular 5-V/2-A power supply. 

Since your PSV is designed to work with 5V/1500mA power input, it will work just fine with more powerful (2000mA) adapter. The concern about charging the battery "too quickly" is grossly unfounded for such a reputable manufacturer as Sony: all internal charger circuits have strict limits on how do they charge their internal battery, and this current will never increase under any input conditions.

As a bonus you will have a benefit of faster charging the battery when playing, as someone rightfully replied to you on Amazon, except the "ballooning" part.