Agreed, the photo in OP is not a legal jump.
ZERTZ rules wrote:
To capture a marble, you must jump over it with another marble (i.e. as in checkers).
FWIW in all checkers variants I know of (and most other games with jumps to capture pieces), each jump is done in a straight line. (Note that if a move is a series of multiple jumps, then you can change directions between each jump, but each individual jump goes in a straight line, directly over the piece you are capturing.)