This is good advice if he wagers real crypto. However, if he just wagers Funfury, he doesn't need to worry about losing because these tokens expire after 24 hours anyway. Regarding the Tower game, it is good with only one devilkin. I tried to play this game with 4 devilkins, but it seems unprofitable even if you want to reach only the second row.
It always depends on luck also and in the long end, with the house edge of 2% (or slightly higher), you will always loose money on the tower game even when playing with 1 devil. It is a good game to grind some more BFG though!