It was probably done by an individual.

"They" can also refer to an individual

wait what?

It's called "singular they". It's used like: "We have a new joiner in our team! They became the talk of the town very fast". I love this feature of the English language, while a bit confusing at first, I think it works much better than "he/she" or "s/he" when talking about someone with an unspecified, unknown or unrelated gender.

Interesting read about the topic: https://www.oed.com/discover/a-brief-history-of-singular-the...

"Someone is at the door asking for you."

"What do they want?"

This is the standard way to refer to an unknown person in English, anything else sounds awkward. "What does the person want", "what does he or she want", "what does this 'someone' want", none of these will sound natural to a native speaker.

This really shouldn't be some surprise. You probably do it on a regular basis without noticing. Shakespeare uses it in Hamlet:

There's not a man I meet but doth salute me As if I were their well-acquainted friend

English has always used the singular they, especially (but not always) when the gender of the target of the pronoun is unknown.

ƿrong. "they" is norþmannisċ. It sċuld be he, forðat hē and hēo ƿuld'fe melded into he, and forðat Englisċ is an Indo-Europisċ tung, ƿere ƿerelie is ðe first kin.

If they did refer to an individual Minecraft expert for an advice, then it counts as a team effort.

What if the individual Minecraft expert was themselves? I mean, having been singlehandedly responsible for team efforts in the past, I get it. :D

It is a bit of a clickbait since they used commandblocks, not just redstone. But it's still impressive

From the video description: "I built a small language model in Minecraft using no command blocks or datapacks!"

From the video description:

  I built a small language model in Minecraft using no command blocks or datapacks!

Can you explain the difference (for non-minecrafters)

Command blocks can only be obtained by cheating in normal gameplay, they are used to execute server commands automatically. Using them to build a computer in the game kind of defeats the purpose of the exercise, since instead of using the game's physics to build your device, you're now mostly doing scripting with minecraft commands. The author explicitly said they didn't use any in their build.

The confusion might come from the author using commands / external software to generate and assemble parts of the redstone machine. The final machine doesn’t use any command blocks as part of it’s operation, but the description is a bit ambiguous here

I think you missed the 'no' in there. They did not use command blocks.