Does this sentence make sense? That is so incredulous, I am not sure.


You have the wrong usage for incredulous which is applied to people.

The Oxford Dictionaries has

(of a person or their manner) unwilling or unable to believe something.
Journalists were even more incredulous when the fishermen said it was a good deal and they were happy about it.

I think the word you want is

1 Impossible to believe.
an almost incredible tale of triumph and tragedy

or the informal use given

2.1 informal Very good; wonderful.
I was mesmerized: she looked so incredible


Welcome to EL&U. It is grammatical but, in the vast majority of cases it is incorrect. Incredulous is defined by the Oxford online dictionary as

(of a person or their manner) unwilling or unable to believe something

so a thing, with the possible exception of an Artificial Intelligence, cannot be described as "incredulous". If you want to say that something is difficult or impossible to believe the word you need is incredible defined by the same dictionary as

1 Impossible to believe.

2 Difficult to believe; extraordinary.

or, informally

Very good; wonderful.

If a person finds something difficult to believe then they are incredulous but that is because the thing they find difficult to believe is, for them, incredible in the first sense quoted above.

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