I'd hesitate to say 'just', and there is a rigorous definition of aftershock that this may or may not fit, but it's very close to the big one last month and certainly related to it.
So I'd go with 'yeah, basically' in the absence of a seismologist telling me otherwise.
In January there was a 6.9 quake here in Chile, and seismologists said it was an aftershock of the big earthquake of one year earlier. For what I recall, any earthquakes within a couple of years of the big one are most probably aftershocks.
So I'd go with 'yeah, basically' in the absence of a seismologist telling me otherwise.