It seems to me that these two statements contradict each other.
There is no contradiction. The AOA sensors were not
serviced, meaning the crew had no knowledge that they were not protected during aircraft washing.
Why would they suspect any problems with AOA sensors if there was no maintenance done to them?
I assume that if an aircraft is washed or painted, there is always a possibility of sensors being left inoperative or misreading?
One could also assume that whatever washing or painting was done, that the sensors were proctected, as is standard procedure. You really cannot go fly "presuming" all kinds of glitches.
Starting a stall manoever at low altitude
They didn't start a stall manouver, they wanted to demonstrate speed/stall protection. Due to blockage of AOA sensors, such protection was inoperative. Furthermore, change to direct law prohibited the auto-trim system to move from its full nose-up position, causing another stall.