How much did Covid-19 reduce our planets Kardashev score?

Hasn’t moved it at ALL !

It didn’t.

Covid 19 has had no effect whatsoever on where earth would be on that scale. Your question shows a fundamental misunderstanding of what it means.

And your question from five years ago also showed a misunderstanding of how the world operates.

Success or failure is not measured against others; it is measured by how well you self actuality to the potential of your gifts.

The Kardashev Scale is ridiculous.

It slightly decreased our energy use, inconsequentially slightly reducing the already-high odds human civilization will eradicate itself by its pattern of mistakenly over-rating excessive ever-increasing industrial activity and energy use (q.v. the Kardashev Scale) as an good thing.