Tubes can measure straight even though the head tube lugs have been stressed and pushed in changing the head tube angle. Looking at the photo's on your _Bay ad I say this may be the case. The top lug looks pretty stressed. Cameras can always make a straight line look curved but the downtube lug does looks bent in and the hairline cracks do support that. I can't say for sure as photo's can make things appear curved.

The only way to really know is to put it on an alignment table and accurately measure, 2nd best is to build the bike and ride it like others mention. If the front tire is close to the downtube like the way a track bike looks is another indicator, a road bike gap/overlap shouldn't look like a track bike.