I finally published the translation of the guide on the language most can comprehend:
Securing Your Seed Phrase with Washers

Hope you enjoy it and I am waiting for many suggestions!

Wait, and here I thought 3D-printers would be able to print in color.... Google tells me it exists, but at a whole different price level (a few thousand to hundreds of thousands of dollars).

I think we might be bordering on the ridiculous here, even for someone as paranoid as me. Someone would have to know your entire system, figure out where you stored that photo, hack in to your device to view the photo, find your seed phrase, break it and then reseal it, recreate the photo you took with the same angle/lighting/surroundings/etc., and then hack back in to your device to replace the photo. And all that to only compromise one part of what is presumably a multi-layered back up.

The attacker in question will almost certainly look for a different way to target you.

I am sorry for bumping this but lately I have been trying to figure out how this backup method works, so my questions about this might come across as ignorant.

I do have some CAD experience so I get the washer part, but what is that black thing that is holding the washer in place? And do I need one for each washer (i.e. word)? And according to the GIF showing the thing moving, it looks like you just rotate it to hide/reveal the washer? Or does it open/close?

I wrote a thread, there is a gif and a video of the whole process:

Securing Your Seed Phrase with Washers

I hope that reading that you will find aclarificatiin of your doubt.
Anyway yes, the jig is meant to hold the washer you are stamping in position. You open the jig, insert the washer, stamp a letter, rotate the upper part, stamp the other letter and so on.
Then you open it, remove the stamped washers and insert a new one, then close it again.
So yes, it opens and closes, and you need only one jig.
In case, just ask.

Anything that automates something adds the risk of storing the data.

If you drop 24 washers without knowing the order, your backup is worthless.

I think he’s actually referring to the washers with the serial number of the tamper-proof labels.
It is an additional layer of complexity. This is meant to avoid someone breaking the tamper-proof labels and substituting those with new ones without the necessity also to restamp the washers, which requires new identical washers, with identical labels, and stamps.
Not perfect, but I guess effective.

There is a risk with that (additional order numbers would probably fix this) but it's not totally worthless, there is still a chance of finding correct order when you know 24 from total of 2048 words.

I don't like this because it can create more risk in overall setup.
Stainless steel washers are cheap and great, but I am coming up with alternative option for storing seed phrase, it will be released soon.

Exactly.
I didn't modify the files from n0nce (who very kindly offered me a customised version of his jig—or was it one of the parameters in the file?). kindly offered
When I said you could open and close the jig, I meant lifting and lowering the upper part.