No doubt that some(not all) of these "provably fair" casinos have utilized a technique like this to "increase" the house edge....
Its funny to me since most bitcoin casinos offering BJ offer terrible rules anyway + human error, is that not enough for some of them...
There needs to be a fix to eliminate this "deck stacking" and users need to avoid any casino that does not utilize the fix.
Otherwise provably fair is just a fancy word while the casino robs you blind.
Another thing that I have always been curious about is how can you tell for sure that the "randomly generated" client seed is really randomly generated..is there any way to really tell..such a pain to change it manually every time and if this post from the OP is all true it makes no difference.