> it costs nothing to keep an old site alive
Famous last words. This sounds like a "just" as in "I just keep the old site running". The reaction was overboard and it sounds like the suits are lying to cover their ignorance but the old sites should have been made inaccessible.
If you hear yourself or anyone saying a job is "just" a thing, or that something "costs nothing", look for what they've failed to consider.
It's never just.