He's always been soloable, he just takes absolutely forever to kill solo.
This method is a bug, please don't do it. There's a fix coming for those who have, as per Kander in discord a bit ago. The ACTUAL way to get it...
It looks like it's bugged and not respawning as fast as it should, or at all. I got my update about an hour and ten minutes after Genghes, but...
The thing is that from what I've seen of the scout shiny collection step is that they had some level of a prompt for "This is something personal"...
I also checked The ToV High Keep zones (Both Heroics and the contested) since there's a whole lotta books there, still nothing.
Also checked Erudin Library
I said he has two different heals. We had one take him to where ever K was, one take them to full.
We tried that, he heals up regardless, far as we can tell. The guess is the big-heal is timed at roughly 4 minutes per go, and the heal on tarkas...
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