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As the answer by @gvdhoorn pointed out, isValid is a static function and not related to your time instance.

To get the result you expected, you should change your code to:

#include <ros/ros.h>

int main(int argc, char** argv) {
    ros::init(argc, argv, "rostime_example");
    ros::NodeHandle n;

    // default construct a time
    ros::Time t;

    ROS_WARN_STREAM("time value: " <<t.toSec());
    ROS_WARN_STREAM("time valid: " <<t.isZero()==false);

    return 0;
}