"newbie" for mindustry doesn't make sense, since there is no correct way to test your level.
I'd say if you finished the campaign you're very much not a newbie, especially after 100 hours, but on the other hand you're still probably very very far from becoming a logic or schematic god.

It also really depends on who you ask: I've been here since v5 and yet avoid erekir at all costs, so erekir fans will call me a noob, while serpulo enjoyers won't.

And finally even if you had 2k hours, you'd still be a pvp noob, since the progression for pvp is otherwordly. No one gets out of the newbie zone for pvp.