The original Hebrew is the word re’em which bascially means “beast with a horn.” One possible interpretation is the rhinoceros. The Hebrew word : tow’apaha in Numbers 23: 22 refers to more than one horn, so it’s likely the translators intended to infer a wild, powerful, but recognizable animal with a single horn.
This word was translated monokeros in the Septuagint and unicornis in the Latin Vulgate. The animal shown in the OP is certainly an example of a powerful, untamable animal with a single horn. It looks similar to an ox and a rhino. Atheist scientists date it to exactly the same dates we get from dinosaur soft tissue when carbon dated - around 29,000 years ago. Carbon dating assumes conditions on earth have been the same for millions of years. When corrected to account for pre-flood conditions, you get dates in line with bible chronology.
The Indian Rhinoceros is a possibility, having a single horn and living with humans today. - Rhinoceros unicornis
But the beast in the OP has a much bigger "WOW" factor and is certainly not excluded. It is a truly magnificiant creature; superior to the Indian Rhinoceros Unicornis.
That simple observational fact makes me think that "Elasmotherium sibiricu" is the correct referenced animal.