What about Bytecoin? Does it not meet the requirements of most "known" anonymous coins?
Went dead for a year, but extremely active development in 2015 and extremely impressive feature list.
Second-highest market cap of Any anonymous coin (other than Dash).
Doesn't count as anonymous because 80%+ of the utxoset is owned by entities who mined them before it became public and global, which means that those entities can deanonymise pretty much all future transactions.
Marketcap is irrelevant as it's easily inflated (doubly so when all you have to do is slightly bump the price due to the massive amount that's already emitted).
In neither case is that knowable, so it's simply an empty argument that is guaranteed to be made by those with an incentive to make it. Probably less knowable in the case of BCN since the anon system is better.
No, it is well documented that the claimed 2012 launch is a fabrication or at best highly questionable.
You can put any date you want in a block.
I could easily recreate the entire first "two years" of the BCN blockchain on my own computers with year 1980 in the headers. I'm a fan of big hair and Cyndi Lauper
♫ Oh girls just want to have fun ♫