Yes, Stevens was our Ambassador. (And as such should have had decent security wherever he was).
No, the building ("compound", actually) he was at was not The American Embassy there, even though our State Department leased and used it.
That compound has been described as a "diplomatic mission" or an "annex" also. Wiki is open source and frequently contains errors, some of which seem insignificant to the semantically impaired.
It was an tempt at politeness. It seems that your point is off in terms of the Embassy being completely different from a consulate as far as security and the consequences of security failure, see The Executive Branch meeting the casualties on the tarmac. They did not do this because of good character. It was required.
In any case, a mortally neglected consulate is quite different from “dead Americans”, a regard given to travelling students on a Eurail pass, which, in this case, just don’t command the attention due to the Consulate (equal to the embassy for security, esp when housing the Ambassador, according to the citation below, and according to common sense.
As federal agents, all DSS Special Agents have the power to arrest, carry firearms, . . . DSS Special Agents protect the U.S. Secretary of State and foreign dignitaries.
When assigned to domestic field offices, DSS Special Agents are responsible for. . . providing protection for the United States Secretary of State and . . . U.S. missions, embassies, and consular posts.