When the term IP ban is used by multibotters, is quite often not referring to a straight-up , sensu stricto, IP ban. IP's are easily changed. And furthermore, they would use it to flag accounts, but manually checking them would be a necessity.
It's normally used to define any sort of linkage between several computers that were intended to separate bot accounts, which could be using even different IP's; the methods that Blizzard uses to flag accounts are unknown to us (It could be any or several of dozens of Hardware ID's , network Identifiers, Wow installs, MaC ID's , etc)
Right now Blizzard is (also in this aspect, sigh) ahead of botters. Both the most common obfuscating methods, including VPNs and Virtual Machines, and of course changing the basic ID's is proving to be ineffective. Nothing is effective when software detection happens, but taking that instances of detection apart, classical hiding methods are not proving useful either.
Take into account that, as explained in the vids, those spoofing tricks are not changing the real, Hardware link IDs for both your HDD (which is the HWID) and MaC address. The fact that you can return to default values is a clear proof. And the "default" information is also easily obtainable, so if I were Blizzard, I would use it.
Nothing is safe anymore. It never was, but now it's even more unsafe than ever. Blizzard position against Bots has taken a really harsh step forward, and their methods used and account actioning patterns prove it.
TLDR; check ban reports. Don't use the bot if you have a Main account in the same household OR benefiting from the bot accounts in any way, cause the danger that you'll lose it has gone to almost non-existant to almost sure.