So you've never had a better mixture of 60% H2O and 40% ethanol? Because that's what's left after 4x distillation followed by filtration, as claimed in the description.
I'm always baffled by people swooning over "good vodka". You're drinking industrial alcohol, diluted with distilled water! There's no flavor left.
Maybe you just have bad taste buds, i am baffled by people who don't taste the difference, an it's probably because you drink vodka that is made with distilled water.
The Vodka that you said is one of the best you've ever had is
"Bei dessen Herstellung wird bestes Dinkel Getreide 4-fach destilliert."
I had actual vodka made from aldehyde free HPLC grade dry alcohol and deionized water. (Remained after some cleaning of things.)
That thing literally has no taste and it's both smooth and burning sharp at the same time.
The other vodkas tend to have sugars and esters in the mix. You can detect them using a classic test.l, which shows how much the marketing about distillation process is worth. They taste completely differently - depending on brand as well.
BTW you can do that too by drinking one of the best Vodka's i ever had:
https://www.vodkahaus.de/snow-leopard-wodka-