The advertised house edge for the Stake in-house Black Jack is 0,5%, which means longterm I will lose 0,5% of all bets placed.
That's incorrect. You have a fundamental misunderstanding of what House Edge means.
House Edge has nothing to do with percentage of winning vs. losing hands -- it has to do with the percentage of a player's original bet that goes to the casino on average.
A meaningful analysis would involve knowing total $$ amount of winning hands vs. total $$ amount of losing hands. This is because blackjacks pay 2-to-1, so the actual house edge is misrepresented by assuming all winning bets are the same $$ amount as all losing bets.