> I think lichess is typically ~300 points above chess.com.

Yeah, no. They are two different rating systems (not ELO incidentally) with different curves, there isn't a fixed difference you can apply. At the high end of the scale lichess ratings are below, not above, chess.com ratings. E.g. Magnus Carlsen is 3131 blitz on lichess [0], 3294 blitz on chess.com [1].

This website [2] tries to translate between the sites, and figures that a 2925 lichess blitz rating (the closet on the website to the one reported in the paper of 2895) translates to 3000 chess.com.

[0] Multiple accounts but this is the one I found with the most blitz games: https://lichess.org/@/DrNykterstein/perf/blitz

[1] https://www.chess.com/member/magnuscarlsen

[2] https://chessgoals.com/rating-comparison/#lichesschesscom