While I agree that "no comprehension at all" seems harsh, I don't think anyone would jumble things up between moon and mars unless they got the fact wrong in the first place.
These knowledge cards are pretty useful, but they shouldn't be taken as the source of fact (at least right now) unless one opens the link to check where that card is extracted from.
Yes, but a human who don't understand a word lacks the vocabulary for that specific language and that's the reason they cannot understand or comprehend the question properly. Whereas Google Search does have the vocabulary built in with its data set. The problem here is it didn't piece the words together correctly even though the question is valid.
It is one thing to not understand a word in the first place and another if you cannot piece it together i.e. assuming you know the language.
I agree, but it is a type of failure of comprehension (Google Search doesn't understand the word "poop" either, it's just aware that it crops up in a lot of contexts and can rote-recall multiple definitions for it). Same with the human giving a date for Nixon landing on the moon because they understand moon landings but have no comprehension of who Nixon was (much like Google, which additionally has the unhelpful correlation between mentions of Nixon and mentions of moon landings to factor in)
But in human's case, the lack of understanding of word Nixon is because they didn't know what that means in the first place and they don't have data to know or cross check what that word means. On the other hand, Google Search does have an access to the data (just strings in this case from an article) which it has to verify based on the user's query and then display it as the knowledge card and yet it couldn't because... (I don't know why exactly).
That isn't the question of your comprehension though. You got the input (question) wrong because of your habit and not because you couldn't comprehend the sentence structure. You misread the sentence and that's why you got confused over what is wrong if I get it properly. You most probably wouldn't have done this if you read it as Mars in the first place.
These knowledge cards are pretty useful, but they shouldn't be taken as the source of fact (at least right now) unless one opens the link to check where that card is extracted from.