You can still submit with the blocked scenes it's not against the rules, but yes the way to get around it is with a capture card

In terms of glitches the route for all difficulties and platforms is the same, only some encounters may differ for that you can watch a run, otherwise the tutorial in the guides section should be a good place to start. You should also read the rules, that should answer most of your questions. And for consoles in general it would be preferable to use a capture card however, it's fine to upload a stream we time around blocked scenes, which is also explained in the rules.

Where did I say that? I'm simply stating the fact that there is no interest for this and no material reason that necessitates the use of an emulator.

We can't predict what interest may look like at some point in the future, we can only assess what there is now, which is practically none and one person maybe wanting to run on emulator at some point in the future is simply not a good argument to add it. Allowing emulators in general is typically done in cases where the game only exists on obsolete consoles, or the game itself is difficult to obtain, etc. Which is simply not the case here.

The autosplitter has no auto start, if you're having other issues please be more specific.

Interact cancel is different from takedown cancels there's no quickfiring involved. First of all you need to have explosive gel equipped then If you're attempting to cancel a door you hold aim for a little bit then let go and press alt fire and interact (in this case R1/X) at the same time, if you're attempting to cancel any other interact prompt you do the same thing except you hold aim again at the end.