my experience with Rally Mexico officials tells me they are pretty slow with reactions and/or not always making proper ones (like the jump in Guanajuato, not secured gate, etc) so I believe this was the main reason why it happened so late (red flag decision).
Also Lappi went off some 25kms from the start, so sending some help to recover the car and then restart the stage would take way too much time, minimum an hour but I believe in local conditions closer to two...