The RAT is surprising tiny on the 787, and this is a phone video of a monitor, then run through Reddit compression. I am of course not 100% sure about any of this.
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.
https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcQ95qKj...
edit: here you might possibly see it on the right, a very tiny blurry thing
https://imgur.com/a/CElWKzQ
source: https://old.reddit.com/r/aviation/comments/1l9hqzp/air_india...