Relative to two Delta flights, how accurate can I assume Flight Aware is when checking the status of the inbound flight?

I am on DL1012 tonight ORF-ATL, and it is delayed due to mechanical about one hour and forty minutes. My planned connection, DL300, ATL-MSP is also delayed but most likely not enough to be able to catch it when I arrive in ATL.

When I look at the inbound flight in FlightAware for DL300 it is DL1012!

Both are MD-90's, so possibly the original plan was to use the same equipment but they replaced DL300 when it went MX, probably easier to do at a hub

They just announced a further delay....

Cheers,
Pogopossum