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Not sure. Does everything on a public url need to be friendly to random forum shares? Maybe this is good enough for the people who needed to see it.

It doesn't need to be, but it certainly undercuts the message a bit if it's not.

Unfortunately this particular delivery used a typical slide presentation which deviates from a bunch of its message; and unfortunately polluting history is a pretty typical problem with these slides-as-webpage affairs. I really wouldn’t conflate the medium (which is pretty much typical of the web way before complexity as timelined) in/for the message.

Its a matter of preference. I prefer to go to previous presentaton page.

You should learn to use browser - there is right click on back button

Maybe in your browser you have that option. Not for me.