You can write off the mining right off the bat. Like right now. The volume of gear/juice you need to mine BTC profitably is astounding. That shits dead, its been dead.
As for the rake, I recall their rake being miniscule to begin with. Factor in the low volume of play and yeah, I think 5btc a day is super optimistic for them. Again; maybe the site was much busier than I recall, in which case maybe they made more. But what I saw when I logged in was a literal handful of micro stakes players killing time.
If someone has different numbers for their average userbase at the tables, I'm all ears tho.