alt Hacker NewsI had doubts about the "parked at exactly 0°00'00"N 0°00'00"E", thinking it was over Null Island just because the data wasn't updated yet and it was showing uninitialized values.
But you are right, [1] confirms "0° longitude".
[1] https://user.eumetsat.int/resources/user-guides/mtg-in-opera...
That specifies its position to about 30 metres of precision.
Presumably it's an intentional choice to put it at such a round number, rather than any scientific benefit over it being, say, 10km west or east.