I give you an example where the text of the Constitution was breached, and no-one challenged on grounds of Standing, and you say it is not enough. It is exactly on point, and Keyes and the rest, in fact every Citizen, has standing in this particular case, because the text of the Constitution itself is being dis-regarded.
A case is not “on point” if the Court does not address the issue at point. The case you provided did NOT address standing. To be “on point,” the case would have had to say either (a) there is no standing requirement when a person challenges an action as unconstitutional; or (b) even though there is a standing requirement generally, it does not apply in this case because ....
Again - if the case doesn’t address the issue, it simply cannot be “on point” to that issue. The case you cited didn’t even address the standing issue, much less find that there was standing.