Wow, you are writing to that disk a LOT! 189.2TB is 193740.8GB and on a 250GB disk that's 774 full disk overwrites worth of data, though small writes and disk management often result in writing slightly more than the amount of data you send to the disk, as the controller shuffles data around to improve read and write speed.
The warranty limit on Samsung SSDs used to be 1000 overwrites, so that 774/1000 figure is pretty close to the 85% health that's been "consumed".
There was an article a while back, admittedly on a much older model - the 840 EVO, where someone deliberately wrote their disk to death, basically the disk hit zero on the wear level count about a third of the way into its actual lifetime. 1000 overwrites is the limit where it's guaranteed to continue working, but a lot of the time it's closer to 3000x before actual death.