No of course not. The fires were started mostly from dry lightning strikes so no they aren't the cause, However CC is exasabating the bush fires due to a warmer, drier climate.
Yes the size & ferocity of bush fires are am indication of a canary in the coal mine & yes Australia is going bear the brunt of CC due to it already being part of he driest continent on earth. Only the ignorant or stupid do not realise this.