I agree with you. I think the 'wonky' comment was more to serve as justification for the plug than an actual criticism of Excalidraw.
Excalidraw is my favourite thinking tool, and the style it produces is just the right level of limiting, disarming, and professional at the same time.
It's not, I genuinely find it harder to read diagrams. And also the plug is very relevant, I wanted to share, it's not a saas it's a free tool.