Seems like a reasonable reply to me. Lots of normal ECGs get reported as abnormal by the computer when it analyses it. Leads to lots of anxious waiting by lots of pilots and air trafficers. The algorithm in the machine is designed that if it says 'Normal ECG' then the trace is truly normal (ie there are no false negative reports). Unfortunately this leads to quite a few false positive reports.
A fair amount of 'subclinical' disease is found on these routine ECGs so it is worth getting a cardiology opinion if the machine says a trace is 'abnormal' but rest assured in the vast majority of cases, the cardiologist reassures you that the trace is just a normal variant
Hope that puts your mind at rest. Let us know what the cardiologist says
BtD