Think the point is the criteria for disqualification and if there is a determination and who must make it.
Under 35? Ok, a state can clearly see that they are under 35, it's not a judgement, it's just a boring fact.
Not a natural born citizen? Again, a sinple fact.
Failed to appropriately follow that state's procedures to get on the ballot? Again, local determination is easy.
But if the only disqualification proposed is 14th amendment, needs federal government (and evidently Congress specifically, which I didn't expect) to determine. The states cannot unilaterally declare a federal candidate to be an insurrectionest, no matter how obvious it may seem. If it is so obvious the federal government should have acted, buy if they don't, there isn't a judicial remedy.
In short, just vote against the dude. The three states were all symbolic only anyway, They weren't going to sway the primaries and especially not the general election. Use this energy to motivate folks to go vote against him, that is the only remedy.