It's not a mistake, it's what "nothing" means. Things that are relevant aren't "nothing". If you want to talk about something that matters then don't call this thing "nothing" because this word stands for what doesn't exist. What doesn't exist doesn't matter; if it did, we would say it exists and we would call it something.
Also, the universe cannot "come from" something that isn't there for it to come "from". You're playing with words. If you read this thread back you will understand why the universe cannot even "come from" at all.
The universe is not a definition.the universe is the definition of nothing.