Several sites including this one got a response from a representative for Antec/Tyan discussing the report some weeks ago about a potential incompatibility between an Antec PSU and a Tyan motherboard. The orginal article is on Anandtech. The response states that as far as they are aware of, no such problem exists and in testing they found the hardware to work just fine.
"Tyan has done extensive testing on a number of systems both based on these boards and power supplies, as well as boards not listed in AnandTech's report, and could find no evidence of stability or undervoltage problems while using Antec power supplies."
Is it a possible a mistake was made? Of course, but time will tell what the true story is.