I think landscape fabric prevents weeds from growing up out of the ground.
However, because fabric is permeable, weeds can grow on top of the fabric and the little wispy roots can penetrate it.
I've seen this first hand in my own yard with professional landscaping and rock beds, not mulch. The tiny amount of dirt on the rocks, or dirt that blows in from the environment is just enough for a weed to grow and the rocks give it support. The weeds are weak though, and you can pull em or spray em, and the beds will look immaculate.
Like someone else said, a weed can grow in the expansion joints of a sidewalk or driveway. That's why they are weeds.
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