You are correct. Matt Levine discussed this in more detail in his last column (scroll down to the Anthropic section): https://wallhop.io/https://www.bloomberg.com/opinion/newslet...

Yes, it is analogous to selling covered calls on stock. It’s $72B in “lost profits” that they would have had had they held onto it instead of selling it.

Inclusion of SAFEs makes this IMHO the most plausible explanation.

I do not expect to find that Anthropic invested enough in the SAFEs of other companies to lose $80B on their investments.