That's... not whataboutism, it isn't an attempt to distract from an accusation or problem, it's the opposite of that in fact.
This advancement is objectively good, it's one of the issues raised later in the twitter thread even, and (s)he chooses to change the focus to another subject.
Whataboutism would be "Yeah, well, who cares what Starlink does, NASA launches rockets all the time and no one complains about their emissions"