And they do apply the tax rate uniformly with each tax bracket. They have the power to set up brackets and be uniform within those brackets.
That’s how they get around what you might consider the origial intention of uniformity.
By setting up brackets however they wish, they get a progressive tax code.
Uniformity requires a single, uniform definition and description of the thing to be taxed, and the way the tax is to be calculated. Tax brackets are so clearly and undeniably in violation of that requirement that any judge who rules otherwise should be impeached and removed from office in dishonor and disgrace.