Notice her form. Her flexibility allows her to have enough hip flexion to maintain a tight back throughout the entire range of motion. So don’t try unless your body is ready for it.
This looks like it is from around the same time she did her 200kg x2 Squat.
Here is how you can build your own DIY T-Handle.
Update: Here is Apti Aukhadov doing his set
And of course these are not done only in Russia. Here is Fernando Reis doing his set.
Great exercise for strengthening the lower back and the back of the legs.