That is possible if do good SEO on the videos.You can promote the video if you wish.You can't possibly know why the channel owner hasn't uploaded anymore unless it's your channel. Besides, look at how many views the videos have. One of the videos has 97,000 views and another one has 74,000 views. That's over 171,000 views for only 2 videos. The uploader probably made good commissions from those 2 videos alone. For that channel in particular, it doesn't seem necessary to upload a lot of vids.