No, each session is encrypted separately. Your connection to the wifi router is encrypted with a different session key than someone else’s connection to the same wifi network.
Can't this trivially be worked around by sending deauthentication packets to kick the victim off the network and then capturing the 4-way handshake when they try to reconnect, which you can decrypt without bruteforce because you already know the network's PSK?
There is a deauthentication attack which can really annoy people, and I think WPA2 can be broken pretty quickly, but I don’t know enough of the details to answer that question.