Anyone familiar with Dudukoid low d whistles?

I recently came across aluminum and plastic low d whistles by an ebay seller “Dudukoid” from the Russian Federation. The whistles look well made, and are very inexpensive. I was wondering if anyone was familiar with or had any experience with these whistles?

https://www.ebay.com/itm/Low-D-Whistle-Irish-Flute-Recorder-Handmade-/143931844540?_trksid=p2349624.m46890.l49292

Nathaniel Dowell (a member of this forum) talks about a plastic whistle from this same maker, here:

https://www.youtube.com/watch?v=liidEEM9ivc

Interesting, they look a bit like an MK clone.

I wonder about the comfort of the mouthpiece due to the block not coming all the way back.

Thank you for the information. Nathaniel’s video and video watcher’s comments were a great help.