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All true.
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One guy I knew (he died) had precisely one thing that seemed like an interesting observation:
Pictures of the pre-1972 Paul VI compared to post-1972 Paul VI had different length ear lobes.
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While ear lobes and the nose will lengthen with age, the jaw line will droop -- all the effects of gravity on an aging body. Hair lines will usually recede with age too. Most elderly people will lose one to four inches of height as their vertebra crunch together. Thus, the fact that different length ear lobes were noticed is not unusual.
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However, bony structures like check bones and strong eye brows will not change. Thus, if available, compare photographs showing pictures of his eyes, and of his cheek bones. Look at his ears. Do photographs of the pre-1972 Paul VI and post-1972 Paul VI show the tops of the ear lobes in line with the eyes? If there is a difference, that would be significant. The cheek bones should be of the same height.
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If Paul VI was able to escape the Vatican in 1981, he might have had some minor plastic surgery. More than likely, his supporters applied makeup, used a wig, got him a new wardrobe, and/or created a diversion to enable him to escape unnoticed. Or perhaps, he was allowed to escape with the warning not to cause any problems or he would be killed instantly. No doubt, during his imprisonment in the Vatican, he was threatened repeatedly.
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Frankly, I would like more information, and the witness of more people before I believe this story that Paul VI had an impostor take his place in 1972, but anything is possible today. Nevertheless, I have heard this story about an impostor since 1978, so the jury is still out.