I dont think so, it is just too good to be true if the free spins worth 30BTC. As what I know, free spins has no exact value. Players may win big or even win nothing from it, and of course there is still wagering requirement if we win something from the free spins.
I tried to look for more info about this 30BTC code, but I got nothing on the site under the promotions tab.
I believe there is no code like this because if they do have some promotion, everyone will be noticed by their email. I wont say that freespin is not have any value because whether you win or not depends on your luck as well, I think someone ever manage to have this payout before by completely achieve their wagering requirement before
Btw if you got huge payout from slots, I think it is not that much to complete your wagering requirement, just need to be patient and luck, may be some strategy will workout too
in just your common sense you will able to know that free spins doesn't really have that big value for you to get serious. If you can complete wager requirement and cash out then its your lucky day but mostly
do fail out on this matter.