Has to be power control, right? The card needs to be able to turn the server on and off after all. Maybe also more standby power. I don't know about that era, but these days the BMC (generic term) also *is* the video card, so that could run over PCI. But no VGA out so maybe not.
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But *real* server VGA redirection can work in both ways. Either you have a VGA capture system pulling VGA from a "normal" VGA card on the PC, or (more common these days), the BMC chipset *is* the main VGA card connected over the PCI(e) bus, and thus also drives the VGA connector.
This is why you see lots of "Matrox" graphics on servers. They're not Matrox chips. They're Matrox IP cores embedded into BMCs, like the Nuvoton WPCM450 which contains an embedded "Matrox MGA G200eW" GPU.
