My coupe curbside handle was not loose at the rear of the handle, but was loose on the front of the handle. So it appeared to be a fix of just removing the door panel and putting a socket on the bolt head and tightening.
I may have missed it on the video, but I recall the video mentioning only a 7MM socket. It turned out the socket for the three bolts holding the handle were 10MM. After finding the correct socket size, it was a simple fix of just tightening the front bolt. It did, however, take about a 6 inch socket extension to reach the bolt head and tighten.
For now, the two rear handle bolts are secure, so an easy fix this time. However, a future fix may involve the JB Weld route.