It looks like each car of a two-car train shows up separately?

But yeah, totally believable ;-)

Yup. Two car trains for some reason are a hack into pretty much every part of MUNI's systems. Thats why in the underground stations you used to hear "N N in 3 minutes." The audible announcements have since been updated, but the old arrival displays that show the screenshot of the control center computer (the squares on the teal lines) still show two car trains the same as two different trains very close together.

I once saw 8 MUNI trains within 3 blocks on King St near the ballpark.

However, this is probably just stale data from the NextBus API :)