Do you even realize that it’s just there slogan? Being the best is very subjective and probably they are the best in there own way. Slogan is a form of advertisement which means it’s normal that you will see some sweet words in there to attract there customers. It’s not there Faqs or ToS which they are bind to put only facts about the casino.

I think there Rollbots and other casino perks is what makes them rewarding and not the RTP for each game because it was set by the provider and not the casino.