The Pro and Enterprise can defer updates all day long.
Not for an infinite period of time, the period of time isn't stipulated directly yet but even Microsoft admits that it is finite:
Some Windows 10 editions let you defer upgrades to your PC. When you defer upgrades, new Windows features wont be downloaded or installed for several months."
Also even if you paid 99$ to get Windows 10 Pro "Security Updates" cannot be deferred, only the Enterprise version of Windows 10 has that option.