As stated earlier MSI makes HP and Lenovo boards. If the VP of MSI motherboards say they don't have specifications yet, that they aren't even talking to AMD yet, that the he doesn't think the specs are complete yet, then it's a pretty safe bet.
Unless you think AMD doesn't want to HP and Lenovo to sell Zen based systems.
Can you provide a quote from another comparable source that says the motherboard specifications are complete? Or that other board makers are actively designing Zen motherboards at this time?