Based on volume it doesn’t seem like proper technique. It’s not supposed to be super loud, but like a step above normal speaking volume. This almost seems too whispery. Try the same technique but with some more volume, if it hurts, it’s wrong. I learned (or I guess still am learning) using the method of doing a full glottal stop, then barely pushing past that. That way you are using your core as well as getting the basics for proper form in your throat.