> This person lost a lot of credibility over decades of promoting corsair engines which failed.

As someone not familiar, can you explain? How have those engines failed and how does that impact credibility regarding this, rather than just being something that didn't work out?

> ...but newer ones offer very few advantages.

From the article, it seems like cost is the biggest advantage (70% cheaper to run), followed by ease of use. And then of course the lack of toxic lead, although I don't know how to quantify that.

What am I missing?

You make a lot of points, but it's not immediately clear to me how they refute the article.