That was a complete shitty post, because Bill Gates said that Bitcoin is better than currency, do you think a multi-billionaire like him is stupid enough to say that? Even if someone really tries hard with all their "super-powers" to find an address with something in it, it would not take years, but light-years to find one with some coins in it.
As they say, talk is cheap
Whether Bill Gates is stupid or not is irrelevant since he may say anything he pleases, it won't matter a thing until he invests a few billion dollars in Bitcoin himself ("don't believe anything you hear"). So far he prefers dollars, not bitcoins, and I don't remember that Microsoft was accepting bitcoins as payment for their software. There have been various as well as numerous rumors, someone even claimed that he had seen some code which was assumed to work with Bitcoin, but the thing is Microsoft is not involved with Bitcoin in any meaningful way