Commander Benson is correct. Plain and simply, what happened before actually happened. Otherwise, anything can be changed - and as Captain Comics has noted before, if anything can happen, why should we care?
People who don't care about continuity because they want to write their own stories don't care about their product. (Try using that "Oh, it had been this way, but now it's going to be another way" at your job sometime - and unless you're the boss, see how well THAT flies!)
Some people use insulting and derogatory terms to describe use of continuity - "slavish" comes to mind - which simply means that they don't want what has happened, they want their ideas to take precedence. For fans, that's probably the way it is, as they're the ones buying the damned books. For writers and artists - it's pure ego, and I don't want to buy some creators' autoerotic endeavors on the page, changing historical elements at will as it suits them - I want a story based on what happened previously. You know, the way the real world works.
Again, unless you want a black Jimmy Olsen and Lex Luthor being a Kryptonian, and Superman's father... 'cause as always, YMMV.
Is there a larger context that this quote came from?
I said all I had to say about Gold Key's Time Tunnel comic books back when Bob was discussing the television show in the TV forum. Land of the Giants is sitti9ng in my pull and hold right now, but have never seen even a single episode of the TV show and it's not available on DVD as far as I know... not yet, anyway. Voyage to the Bottom of the Sea is a distinct possibility for the future, but I want to deal with the comics at the same time as the TV show, and I'm watching Lost now.
What's next on my reading list?: The Mighty Samson.