The sentence should rather be written on n’implique personne d’autre là dedans which happens to be pronounced exactly the same way.
The negative is given by the ne … personne d’autre compound, but can be reduced to personne d’autre in spoken French, e.g.:
On ne mêle personne d’autre à ça. Standard French
On mêle personne d’autre à ça. Colloquial French
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