could be....as I stated, they could've changed the formula from 30 years ago....but...as rule of thumb, never use rust inhibitors or penetrating oils on working internal engine parts, unless of course the engine's been sitting for years and you need to free something up.
I know I've never seen any top engine builders using wd, crc, pb-blaster, or any other rust inhibitors or penetrating oils as a coating on internal engine parts...they use assembly lube, and/or motor oil...I myself use 2T oil...the same oil that I use in my pre-mix.
Everyone's got their own preference and method, so use what you want...but I don't advise wd-40 or any other aerosol spray.