Ah yes... I'm Skimmington Harborough, Esq., I come from a family that made its fortune in philanthropy generations ago. This seems like a pretty straightforward mechanism for covert operatives, to generate a believable (and memorizable) cover that pulls attention away and maintains coherence. That said, as someone who prizes ethical behavior, it's not possible to practice this and remain wholly honest without some so…
I don't think the persona needs to be completely falsified. Rather, you consider which topics you engage in on a given account. For example I consider "tsumnia" to be unofficial/official "professional" username - while I don't explicitly say my name, it'd take you looking at my profile to know exactly who I am.
On the other hand, I have my hobby/nerdy username on Reddit for when I want to talk about the latest Last of Us episodes. Same person, but different aspects of my personality are on display. Its not that the other one is a troll or anything, just one name to talk about deliberate practice in CS education in one thread and then another to make jokes about video games.