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The glacial cycle was longer duration, lower fluctuation.

Glaciers don't melt instantly the moment the temperature flips from "form glaciers" to "melt glaciers". They operate on the integral of temperature -- heat. The temperature determines how fast they melt or form.

These melted really, really fast.

I don't think you understand. There were no glaciers there 6K years ago or humans would not have been able to inhabit the area at the time to leave these instruments. At some point in the last 6K years the glaciers in this area grew to expand over top of of the settlement that was there (that is to say, the temperatures grew cold enough long enough to sustain growth and maintenance of glaciers in this area over the past 6,000 years), and buried these instruments. Only now, are the glaciers melting to the point that we can find such instruments again, as we approach similar temperatures to early holocene (which began 11.5K years ago).

Without taking a position I will point out that your stated reasoning doesn't hold due to how much momentum these systems have and how slowly they respond. It seems entirely plausible that this outcome would still have happened if temperatures had plateaued several years ago.

Do you also wait until the inside of the meat is the temperature you want before taking it off the grill, then are later surprised when it is overcooked?

He's talking about information, not actions to take