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Denial of service concerns seem to be at least briefly discussed in the paper (which I have not finished reading yet):

  2 We do not prevent against a denial-of-service attack where an ac-
  tive attacker intercepts packets and resends them under its own IP ad-
  dress to fool the server’s roaming detection. Such an attack would not
  compromise the confidentiality of the connection but would disrupt it.
(Not the same scenario as you are describing, but still.)

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