In short, no. This is the reason why we can have braille embossed on both sides of a sheet of paper. It’s called interpoint braille.

Holes really only work for small amounts of information where you can feel both sides I think. My grandfather never learnt braille, but he developed is own system using a standard hole punch so he could play cards. That's about the extent of its usefulness I think.

I would wonder if those are just holes, but I wouldn't think, oh wow! braille!  no.

I don't know much about guitars but wouldn't it be more effective to print a depressed area or place the name on the side or edge where sitting flat is less of a concern.

Push comes to shove would it not be possible to remove a little hook shape from the plastic and thread some string through it (like a phone charm) and place the braille on that as well as any other required instructions in shorthand.

Couldn't you emboss it in a rectangular depression?

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Just like reading printed letters, braille, after a while, becomes a bunch of patterns as you move your finger over the words. This is why people can read braille extremely fast. What this means is that if you have the letter *r*, for example, it blends in with the other letters of a word. This pattern-based reading would be lost with holes, because they feel different.

Another reason is that dots are more prominent, when compared to holes. The distance between dots also matters a lot, this can be quite confusing if not done right.

It is possible to read negatives, but the holes need to be deep enough (e.g. reading braille holes on the back of a one-sided braille paper is quite hard, almost impossible).

TL;DR: Make sure the holes are deep enough, and keep it short.