Don't think so. Shinzo Abe also have similar stance but he never say it out loud jer. Takaichi is probably the second world leader who explicitly state that they will go against China should a war break out, other than Biden. Past Japan PMs all maintain silence on this. From China POV, cat is out of the bag already. Even if Takachi change stance or she is replaced by friendlier PM, China will always reserve a response against Japan should hostilities with Taiwan happen.