This is not true either. Whales have not yet been saved from extinction. We must get ahead of some of our poorly-considered development. It's such a big ocean that the dilution factor is enormous. People think of it as all the same place because all we see is the flat level surface.
Whales have needs of certain specific areas.
It's not like they can be moved off into some other area and they will be able to survive in it just fine. Different whales have very different food requirements. Gray whales are bottom feeders. Blue whales are krill feeders. Humpbacks, however, are opportunistic, feeding mostly on fish in the northern hemisphere and krill in the Antarctic.