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Hard to say without an actual link to the twitter post, but I suspect they followed the Curiosity/Ingenuity playbook here, creating a twitter handle that personifies the robot. Posts are made as if it's the actual probe/bot making the updates, in which case the sentence "... that it nicknamed..." makes sense.

Their spectrometer team picked candidate rocks within view of the camera, rock A, B, C... then one of spacecraft manager crew said names might be useful, and few minutes later they were all puppies. Forgot the source, sorry.

It = JAXA.

Ah, makes sense. Not sure why I didn't just assume that.

https://interestingengineering.com/science/japans-moon-lande...

The team assigned nicknames, I think we're talking about Jaxa rather than Slim.

"It" here refers to Jaxa, not the lander.