About the same time as "message" and "impact". And about 50 others.
According to all the online dictionaries I’ve checked, “message” and “impact” can be verbs.
But none of the dictionaries include “flier” as a verb. The word “flier” is always just a plain old noun.
Ah, I just noticed that “peoples” is also grammatically incorrect. And that putting fliers on others’ property is *not* legal, “technically” or otherwise.
Bottom line: The author of that piece appears to be both illiterate and ignorant.