Delisle was charged with armed assault following a confrontation last April in St-Jérôme, north of Montreal.
In a cellphone video that circulated on social media, the 37-year-old can be seen approaching a vehicle, swearing and revving a chainsaw.
The outburst came after a family had followed his car to try to get the licence plate number because he appeared to be driving erratically.
When Delisle reached the end of a dead-end street, he got out of his car and threatened the family with a chainsaw.
In court today, Quebec Court Judge Jean La Rue granted Delisle an absolute discharge following his guilty plea.
He said the victims in the case were also partially to blame. No one was injured in the incident.
Delisle was previously suspended with pay from his job as a pruner with the city of Montreal. He had been an auxiliary employee with Côte-des-Neiges–Notre-Dame-de-Grâce borough on and off since 2006.