I can't say that's been my experience. Seeds from hot peppers are hot, and you can tell the difference between jalapeño and reaper by the heat of the seeds for sure, but I don't think the heat even gets close to matching the heat of the pod.
However, the point of tasting the seeds beforehand could still be helpful, assuming that they aren't sterilized or whatever is done to commercial seeds. The hardware store seeds are tasteless.
Most of the heat of a pod comes from the seeds and the placenta