Advisor and co-advisor withholding information, should I leave the lab?
I don't understand the details of your project, but the methods in your project and in the study by your advisors seem to differ not just in detail. Therefore, you should probably bring up the paper in a meeting, and if you do not see "the point" of your project any more in the light of the other outcomes, and ask/discuss with your advisors the added value of your project, given the findings of their other study.

I doubt that anyone has the money and time to support a PhD student working on a project that they do not see any value in.