This is a moving tribute. Stephen Wolfram's writing often has certain faults, which I mention only to be able to say that he has here transcended them; this is a genuine and heartfelt piece of writing which makes me feel sad for his loss.
Yes, it's a very well written, touching tribute and I think it's all the more touching when you're familiar enough with Wolfram's writings to notice the contrast here.
It's one of the most beautiful things I've ever read in my entire life. The reader departs both fallen in love with Elise and tragically heartbroken. Excuse me while I go cry some more in the laundry room, collect myself and annoy my wife with a huge hug.
