The case doesn't have an expansion slot, but if you order just the ITX motherboard there is an x4 slot. Since it isn't an open ended slot though, the question is where to find a PCIe 4.0 x4 card. You can certainly find 10gig cards that will fit. While the math works for performance, there don't seem to be anyone making 25gbit ethernet cards in x4 though.
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The case doesn't have an expansion slot, but if you order just the ITX motherboard there is an x4 slot. Since it isn't an open ended slot though, the question is where to find a PCIe 4.0 x4 card. You can certainly find 10gig cards that will fit. While the math works for performance, there don't seem to be anyone making 25gbit ethernet cards in x4 though.