You have just literally described what an argument is. Please proceed to the classics dept down the street to learn about it, oh wait you can't, they removed it.
That would only come close to working as an argument if X and Y were mutually exclusive, but this article doesn't even bother to make the case that they are, nor is there any reason why they would be.
Deadline X isn't relevant when deadline Y comes earlier. That doesn't mean that deadline X couldn't also kill the project, that just doesn't matter when you can show that deadline Y already did.
