I would relate the statement from Caniche more to what happened BEFORE the accident. Or better what DID NOT happen before the accident for some reason, especially the preparation with respect to flooding by a Tsunami.
And it is quite evident, that this risk was not addressed as it should have been. Maybe it was money TEPCO wanted to save, maybe it was just carelessness, I don't want to guess about the reasons and the outcome is always the same anyway. Once the damage is done, it is too late.
If you are the owner of an NPP, you have to ensure that
1.) the plant will not loose electric power supply
2.) if electric power is lost, the reactor cooling doesn't fail
3.) if it fails anyway, venting and freshwater injection can be accomplished
They were not prepared for this kind of accident accordingly and they failed in all these points, as the Tsunami knocked out the plant completely.
By the way, currently only three reactors are in service in Japan...