Normally, something that answers the question should be written as answer. Sometimes, users write an answer as comment for different reasons:

• They don't have the time to write a more complete answer, and they write the comment as a hint for somebody else who could be able to write a more complete answer

• They are not sure about the answer, which could be just a guess

• The question is not that clear, and they write an answer as comment, hoping the OP comments about that, making more clear what the expected answer is

• They are going to vote to close the question

In your case, both the users who commented voted to close the question. That is why they didn't write an answer.

Normally, something that answers the question should be written as answer. Sometimes, users write an answer as comment for different reasons:

• They don't have the time to write a more complete answer, and they write the comment as a hint for somebody else who could be able to write a more complete answer

• They are not sure about the answer, which could be just a guess

• The question is not that clear, and they write an answer as comment, hoping the OP comments about that, making clearer what the expected answer is

• They are going to vote to close the question

In your case, both the users who commented voted to close the question. That is probably why they didn't post an answer instead of commenting.