I agree, artistically some accents and phrasings can be played more poetically and a bit slower.
But this piece is a showpiece, and speed is what makes this piece a challenge.
In this forum the sheet music of this piece is put online in pdf, I have downloaded it and had a look at level.
http://www.goldaccordion.com/forum/noti/topic-6560.html
Черноглазая казачка - Новиков.pdf [10.33 Mb]
We must realize this is a YT fragment from an accordion competition, and competitions are very different from recitals or poetry.
A certain show element is part of the competition, virtuoso technique is part of the evaluation process in competitions. Maybe the technical aspect is a little bit overrated in accordion competitions, in comparison to violin or piano competitions.
Because these virtuoso pieces are so spectular, they end up more frequent on You Tube.
In accordion competitions, slower pieces or more poetic pieces are also on the menu, but because they are less spectacular to watch, there are fewer of these pieces on YT or other video channels.