The disconnect back then was that he had a significant number of highly lucrative investments, including several in closely related fields. While applauding the efforts back then he wasn't convinced TSLA was the best way for him to go. Given his record I would not argue.
Now the situation is very different, not least because his view of current events is that TSLA is rapidly becoming a global standard of excellence.
For most of us who were in in 2011-2015, TSLA has been far more a choice of conviction than it was a rational choice of risk and reward. For me at the time, bluntly, I removed money I'd put in Kiva loans and put it in TSLA. That is, I was prepared to lose it all. My friend shared empathy for that choice was was not prepared to make a similar choice.
Now, however, all the early logic still applies but now a hard-headed rational money management perspective sees a company that is more profitable than any peer, growing quickly, but now successfully becoming a utility-like franchise, but with massive upside.
Bluntly, When Ford and GM capitulate everyone, not just EV fans, sees huge upside. When the same people see that Tesla is now a public utility participant, in the unregulated sphere...they suddenly realize they've a huge growth opportunity that has been ignored by nearly everyone.
So that has been the impetus for the change my friend's thinking, as I understand it.
Just in case not everyone understands, a change in BlackRock perspective is more influential than perhaps any other single investor. In honesty I must admit I have some historical bias that influenced this post.