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This post is obviously not meant serious.
To the right of the damaged section we can see a thread indicator, so there is maybe around 1 mm thread on the right shoulder. Therefore the centre part was below legal limits.
Before changing tyres, the owner of that bike decided to kill off the old tyre completely by doing a burnout. We can see the flat centre piece all around on the tyre, typical for a burnout.
When changing a motorcycle tire it helps to do a nice burnout before starting. It heats up the tire making it easier to pry off with tire irons.
Is that true?
Yes, but usually not so far that the metal is showing. I learned from this video years ago. Having done tire changes with and without the luxury of a burnout. It is noticeably easier after the burnout.
edit: forgot to link the video. https://youtu.be/dAKIuSjPXxA?t=40
Maybe marginally. It's pretty easy already to take an old tire off, especially on the machine.
Putting a new tire on is always the hard part imo. I usually let mine sit in the sun for an hour before mounting it.