The only flaw here is that it doesn't distinguish between neutrinos, which don't couple to photons but do couple to the W and Z bosons (and probably to the Higgs boson although their coupling to the Higgs boson is really an unresolved issue in the Standard Model) and charged leptons which demonstrably couple to photons, W and Z bosons and the Higgs boson.
A hypothetical graviton would couple to all of the particles in the diagram including itself.
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