Yeah I saw that picture and came back here. I think you are 100% right that the RAT is deployed.
From the video of the runway it also seems like the aircraft didn't do a short takeoff (ADS-B location data is always crappy on the ground in my experience so this is entirely unsurprising).
There was a "smoke cloud" from behind the left engine which could also have just been a dust cloud right after rotation.
The flaps allegedly could be at only 5° (which is why they're so hard to spot) because of the runway inclination.
From the video of the runway it also seems like the aircraft didn't do a short takeoff (ADS-B location data is always crappy on the ground in my experience so this is entirely unsurprising).
There was a "smoke cloud" from behind the left engine which could also have just been a dust cloud right after rotation.
The flaps allegedly could be at only 5° (which is why they're so hard to spot) because of the runway inclination.
The mystery thickens...