The unavailable data you are referencing is irrelevant to the point.

The point is "What percentage of absentee ballots were for biden" divided by "What percentage of absentee ballots were sent to independents and democrats." compared state to state.

All of that is readily available.

In addition, a more detailed analysis of how the republican voters play into this was posted in another comment but it is a side point that supports the primary point.