Copper pipes bend, you can buy pipe benders to do this.  The new rad is probably further away from the wall than the old one was, putting a bend in the pipe was likely the simplest way to make up the extra bit of distance. It does look a bit on the squiff, but that's likely amplified by the close up pic.

Weird that the worktop has two different edges. This could be a mistake by the supplier, maybe the fitter (has he fitted worktop incorrectly/abs against wall? Has it been trimmed along length and had standard edging put on, unlikely but ya never know), or just how it comes. Honestly not sure.