As Qawsedf said, but to make it a lil more elaborate:
Time being irrelevant is not the same as treating the linear progression of time by sheer movement as irrelevant.
The first is a state of being or quality not inherently relevant to ones ability to act. For example, Professor Paradox from Ben 10 treats time as irrelevant, since he exists outside of it. He still isn't immeasurable, as he follows a linear progression of events, despite his timelessness. His actions can be measured, he exists in a state of constant "now". He is, therefore, acausal and not immeasurable.
Contrast what Professor Paradox can do with a proper immeasurable instance like Anos' Venuzdonoa sword, which completely breaks causality, to the point that before even being swung, it already cut you down.