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Lol. That photo is taken in the dark, you can't see anything. All I can see is that it looks like it needs proper foot retention and the rider is a T-Rex. :)
The BT seatpost is probably very expensive to replace if it slips/breaks. The Kalavinka post will be a standard size giving you a good choice of posts to choose from if you need to. The two wedges around the round post are probably more secure than whatever solution the BT uses as well.
The Kalavinka one is no way near as bad you are making out. Both frames are great.
umadbro?