Legal shot.
WPA 3-7:
If the cue-stick contacts the cue-ball more than once on a shot, the shot is a foul. If the
cue-ball is close to but not touching an object-ball and the cue tip is still on the cue-ball when the cue-ball contacts that object-ball, the shot is a foul. If the cue-ball is very close to an object-ball, and the shooter barely grazes that object-ball on the shot, the shot is
assumed not to violate the first paragraph of this rule, even though the tip is arguably still on the cue-ball when ball-ball contact is made.
However, if the cue-ball is touching an object-ball at the start of the shot, it is legal to shoot towards or partly into that ball (provided it is a legal target within the rules of the game) and if the object-ball is moved by such a shot, it is considered to have been contacted by the cue-ball. (Even though it may be legal to shoot towards such a touching or “frozen” ball, care must be taken not to violate the rules in the first paragraph if there are additional balls close by.)
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I don’t see anything in the WNT rules which would override the WPA rule.