I apologize for being a bit confusing in my explanation. Let me try again:

When you ignore the (2) in the triplet, your pulse becomes:

1 .. (3) 2 .. (3) 3 .. (3) 4 .. (3)

In a swung groove, that (3) -- the third accent of the triplet -- becomes the "and" -- so you feel it 1 .. (and) 2 .. (and) 3 .. (and) 4 .. (and)

Does that make sense?