So anyway, Satoshi solo mine and anyone else's solo mine, is not technically a premine, but in a spirit - it is. Saying that solo mine is not a premine is true, but you know, I know, everyone knows that essentially it is exactly the same as premine.
With your definition, Ethereum only had a 16% premine.
Satoshi absolutely didn’t premine Bitcoin.
The "pre" in premine means "before," as in, they mine themselves the coins before they publicly release the knowledge required to begin mining. Satoshi didn't do this. There was no premining of bitcoin.
Despite the definition of “premine” being extremely clear cut and objective, apologists for premined coins often liberally redefine and butcher the definition for financially-motivated, self-serving reasons: “See, Bitcoin is premined too. XYZ did nothing wrong.”
Just to understand how ridiculous this is, if we’re going to redefine premine to mean “any coin perceived to be unfairly distributed”, then we might as well not even use the word at all, because biased investors will use the term to describe every cryptocurrency they’re not invested in.