So what does he mean by the missing letter "n"?
I think Q is saying that the missing letter "n" has something to do with Marina Abramović or Spirit Cooking.
In answer to the misspelling, Q said the below, it’s clear he misspelled by accident in this case.
>>615000
On the move.
Misspelled.
Dont analyze.
Q
Mar 10 2018 14:51:16
Anonymous
615000
>>614610
Why the misspelling? Did you mean Marina?
Mar 10 2018 14:54:01
Q
!UW.yye1fxo
615078
>>615000
On the move.
Misspelled.
Dont analyze.
Q
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Q seems to indicate it was a spelling mistake - don’t analyze seems to indicate it was not a clue - JMO
I do think he likely meant to type Marina.