You’re right, I have not tried the Furutech DPS-4.1 Power Cord with FI-50 NCF Plugs, but what I was trying to do is share something positive with the OP. My power cord of choice right now is the Cullen Cable Gold Series where I bought three of them used for $50 bucks a pop. One I have with my Clayton Audio S-100 (SE) power amplifier, one I plan on using with my Vinshine Audio x Kinki Studio Taihang Power Enhancer that FedEx says it should be here to tomorrow, Friday for my early Christmas present to myself.
To go along with my other 聖HIJIRI Nagomi Power Cords on my LTA Microzotl MZ3 Preamp and my Laiv Harmony DAC.
And at the time I was writing my earlier post, your post was the farthest thing from my mind, at the time.
as far as reselling $5 cable for $250, nothing else is really going on here. I’m pretty confident that their $6,500 cable is this piece of turd for $5 with fancier looking connectors dressed up in a nice jacket.

