My point is the difference between number system and language. We're seamlessly converting back and forth while writing this, but there's a specific amount in our heads that we're trying to communicate, either by word or by number. The number is ambiguous only if you don't know the base, while the word is ambiguous only if you don't know the language. The meme is - presumably - in English, and they're talking (in speech bubble form), so the misunderstanding doesn't really happen. it's only when a secondary 'language' is introduced - the numbers - that it is possible.

Ten in particular, which we usually write as a two digit number because of historical and biological context, still uniquely describes a certain amount without any relation to it being written as the first two digit number. In any language, you wouldn't translate to one two three ten just because they usually write in base four, you'd translate to whatever their word for the number is that you're trying to translate.