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It is (but in russian)

Pavel Zhovner (a lead of flipper devices) wrote about Busy status bar 3 months ago in his Telegram channel (https://t.me/zhovner_hub/2073).

At https://flipperzero.one/ you can find habr.com blog link. The first post in Flipper blog was made by Zhovner https://habr.com/ru/users/zhovner/ (who has a link to telegram channel zhovner_hub).

> Главная идея в том, чтобы сказать людям “отъебитесь на 15 минут” еще до того как вас отвлекли.

This explanation is much more forthright.

For the lazy:

“The main idea is to tell people to ‘F—— off for 15 minutes’ before they get to interrupt you.”