What does Landau mean? (From D. Gross Lecture)

I browsed through David Gross' Nobel lecture slides (URL below) and
noticed the following quote of Landau (1960):

"We reach the conclusion that within the limits of formal
electrodynamics a point interaction is equivalent, for any intensity
whatever, to no interaction at all. We are driven to the conclusion
that the Hamiltonian method for strong interaction is dead and must be
buried, although of course with deserved honor."

What does Landau mean? The N-point function seems to be based on the
integral of the Hamiltonian density, time-ordered and exponentiated,
no?

http://nobelprize.org/physics/laureates/2004/gross-slides.pdf

.

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