Even if it's just 10 years there's a decent chance it's still covered. DDR4 came out just 9 years ago and there was a period where both were used commonly. Not sure how this applies to ECC, though
Yup, Corsair replaced a pair of modules that were ~4 years old for me earlier this year, they even shipped the replacements first before I sent the bad module in - all at no cost in the end (only a deposit for shipping first, which was fully refunded once they received my old modules). I didn't even realize they had lifetime warranty at first, didn't think such things even exist anymore, so it was a really nice surprise.
I had years of infrequent random crashes that I finally tracked to a bad DRAM module - I was kicking myself for not running the full memtest earlier.
Good to see it hasn't changed because that was my exact experience in 2013.
The cross-shipping was nice.
I've bought Corsair RAM over other brands since, which I guess pays off for them.