Question about OWC miniStack STX 16.0TB for Mac mini

I purchased this as a 16TB SSD and it clearly is not. Best speeds I can get is 248MB/s write and 213 MB/s read speeds which is almost useless for 6K video editing which is what I purchased it for. As for whisper quiet? Not true either since you can clearly here the spinning drive rattling inside as it reads and writes. It also takes a few seconds to start up. This item should not be listed under External SSD. Very disappointed and will be returning it.