Generally the American Embassy is a good source of information for Americans, as is the State Department. However, it shouldn't be the only place you get your information. Things change very quickly these days. Information updates can be hung up in the clearance process (nothing gets published or posted without at least 2 or 3 offices back at the Department chopping on it) , tech issues in updating websites (generally at smaller embassies, though--maybe you caught them between stages of the information flow), or just plain user error. User error in the form of the staff getting information slowly, or just incorrectly. However, the Embassy is always a good source of information for Americans on the ground in any specific country. That's their job--it's also their job to serve as the first line of "defense" if you will for foreign nationals who want to enter the US. A visa, any kind of visa, is a "permission to apply" for entry at the US port of entry; not a guarantee. DHS makes the final decision who gets in and who doesn't. However, I digress. The take-home here is that it's not, strictly speaking, the Embassy's responsibility to set or even publish guidelines for Americans visiting a foreign country. The take-home is that today, or any day for that matter, no one source of information is completely reliable.