Did he need to say anything?
If we were one of his options then it would br disrespectful to both his agent, and any other clubs in discussions whilst he was considering all of his options. Hes expressed an interest in playing in the MLS previously, so it seems to me that the whole package on offer (including the option at the end of 12 months, plus the season timings) for example, was just too attractive for him to turn down.
I read somewhere that one Cardiff fan is so convinced that it's all about Adidas sponsorship money, that he's never buying Adidas trainers again 😁. It may well be a part of it but I doubt it's a deal breaker.