Why? This is a bit complicated to explain. Please take the following in good faith in case I mess it up. 🙂

Even though I’m doing quite well English is not my 1st language. I’ve seen students of a new language fixate on stuff many times. So I wanted to check for that.

In my native language number and numeral are commonly used interchangeably. Exceptions are when you want to indicate how many digits a number has and quite possibly maths students and profs.

Also experts in their fields tend to be fixed on detail that is not relevant or used in common language. An example would be a biologist that wants you to stop calling a strawberry a berry (I’ve encountered similar things in a couple of fields). You’re a cs/maths student so at least that checks out. 😉

Even though I’m educated (uni) in biology (horrible hairsplitters if you let them) and cs (IMO less hairsplitting than bio/maths) I tend to adapt my vocabulary to the crowd and mostly keep it simple. I think the meme is stupid regardless whether you interpret numbers or numerals in the first sentence. OPs user name indicates they are German, so they also grew up using the word ‚Zahl‘ for both. (In a way the meme is slightly less stupid when you consider this)

So I tried to convey the term numeral by providing three synonyms - or so I thought. I thought just using the word digit would lead to many people not understanding. Now I’m having the ‚silliest argument‘ while probably being the sillier part in it. It’s enjoyable though.

Back to the silliness: ChatGPT pointed this article out to me. So, while you are absolutely right in the proper use of the two terms it is also true that they are commonly used interchangeably. This might be a recent development though.