how come the official MoH:AA EA site doesn't provide a link to this site ?

Company's policy? It varies from company to company. Some publishers like Sierra pimp fan sites covering their games and some don't, like EA. They did e-mail me and ask for my address so they can include in their press list, so I guess they know of aa.com's existence.

2015 the developer on the other hand, well, they're 100% supportive as you can see, and you don't see developers like that too often, that's all I can say.