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I would say that that more broadly, all woven/coated fabrics lose waterproofness with again (e.g. silnylon does as well). But yes the waterproofness of the fabric has been age tested. I had that done by Richard Nisley (from BPL) who also tests fabrics from RSBTR, TT, MLD etc. I think he is the source of RSBTR's numbers, so the following stats are directly comparable.
For the X-Mid fabric, you can see the full results including close up photos of the fabric at the bottom of this page on BPL: https://backpackinglight.com/forums/topic/massdrop-announces-a-dan-durston-tent-2-people-2-hiking-poles-29-oz-199/#comments
But in short, the fabric holds up well. It was still above 1500mm at the end of Richard's extensive wear tests. I'm not aware of any woven fabric used by the cottage gear makers that is substantially higher than this at this point, because to go higher you'd be making other compromises (e.g. super slippery silnylon, reduce tear strength with more PU). The HH results for the X-Mid's sil/PU poly are similar to the results of TarpTent's new very waterproof fabric at the end of the same wear cycle. The X-Mid fabric is referred to as having a 2000mm HH, but it is really >3500 mm when new and still around 1600mm after extensive wear.
You can see comparison specs from Richard Nisley's other fabric tests here: https://backpackinglight.com/forums/topic/fall-2016-fabric-samples-compared/