The procedure works real fine, just take it easy on applying the impact, no need to spin 2000rpm. I tried it today on my old 2012 tensioner just to see how it worked. It retracted easily, but the problem is any socket used is to big OD, and the tensioner rod is not pushed back quite far enough to clip on the retaining clip. I found a plastic tube exactly correct size to just hold onto the end of the tensioner rod, and adapted it to a 3/8 drive socket. Now the idea works perfect, takes 20 seconds to retract and clip. Alternate idea would be a drill instead of the impact. Either one does the job fine. Main thing is the socket and rubber shown needs improved. Not hard to make your own custom tool.
Thanks for the idea.