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I don't now what exactly is intended with "recorded" in this context; the others seem "recorded" to me(?) I think it's more likely they read over or misinterpreted "one of the largest", or something like that.

Maybe a reference to climate alarmism?

You can arrive at any superlative (or first-ever) that you want, as long as you string up enough qualifiers in front of it.

I think they forgot the "one of" more.

Also forgot the artificial / man made bit. I guess the big bang would be the biggest non nuclear explosion in history?