I’m looking for a better understanding as well, but I don’t think the sky is falling.

Even in the original post, the author stated that the theorized exploit has not ever been demonstrated in the wild, and it seems like you would need one of your channel partners to go out of their way to attempt this at significant risk to their own funds and reputation.

I’m confident that people smarter than me are working on a solution. Lightning still only makes up less than 0.1% of Bitcoin balances, so we’re very early in terms of potential severity. Even if the network needs to be entirely retooled from the base (which I doubt) I think that would be very feasible. If 10% of Bitcoin were locked in lightning channels, I might be a bit more concerned.