No, I just think the system noticed the pressure drop and/or when pressurising it took too long (because it was compressing air in the system). Even using the official bleeding procedure you may get the same errors you have:
While performing air bleeding, the accumulator pressure drop may cause a buzzer to sound. As there is no problem, continue with air bleeding.
During air bleeding, DTCs for pressure sensor malfunctions, etc. may be stored. After air bleeding and if instructed in the procedures, clear the DTCs.