There is a lack of understanding of Turiya. Turiya is not an observer.
Thou liest in the Cosmic Waters in the state of Turiya, which is
neither absorption in the oblivion of deep sleep, nor involvement in
the objective movement of the waking and dream states.
Srimad Bhagavata Purana VII.9.30
Turiya is a state beyond deep sleep, dream and waking ...
It is not so. As per data from https://ourworldindata.org/, there were dips at 519 AD, 1325 AD, 1627 AD. And later around 1945.
In regards to the concept of karma. It is not just applicable for living entities in human form of life. There are 8,640,000 species. Human form is just a subset. A living entity roams throughout these forms based on karma, under ...
Since OP wants answer only from Devi Bhagavatham,Let me answer from it. Though Lord Rudra, Lord Vishnu and Lord Brahma are said to be sinners or influenced by karmas, they are not as influenced as we are. So they too can remove our sins if not all (only according to this Purana) to an extent.
If you want to get rid of all sins, you should worship Devi.
Gods as karma and sinners according devi bhagavatam When they are sinners how they can remove my sin?
Lord Vishnu is not a sinner, since he is the supreme Brahman himself. From the Bhagavad Gita:
10.3 - One who knows Me as unborn and without a beginning; the great Lord of the worlds — is
undeluded among mortals and is liberated from all negative acts.
jaya-kāle tu sattvasya
devarṣīn rajaso 'surān
"When the quality of goodness is prominent, the sages and demigods flourish with the help of that quality, with which they are infused and surcharged by the Supreme Lord. Similarly, when the mode of passion is prominent the demons flourish, and ...