Honestly, they say:

Pick one out of the four 5* FK favored by the development team at a DISCOUNT.

... And so, where is the DISCOUNT? There is no DISCOUNT at all here, that's still 30€ for a 5*, the "standard" Nutaku price for them, even if there is an extra 10+1 Roll. Oh, and note in this regard, after almost 1 year, they still can't wrote a clear explanation about the Gatcha: there is no information about 1 or 10+1 Roll, not even in the IMPORTANT panel.

Anyway I don't understand how Nutaku set their prices. For them a 6* (60€) is only worth two 5* (30 €) while in Gatcha they are worth TWELVE 5*! (0.5% vs 6%).