You are probably remembering that from the discussion of a particular Marlin 1.1 RC3 build. The exact quote you read was probably this from the last message in the thread:
I think I read a description that his probing sequence check the z heights of the 4 washers from the current attempt against the results from the previous one and does something (aborts? retries? pauses for user input?) if the difference is too great. I may be remembering this incorrectly…
The proposal that poster was recalling entailed comparing the previously stored compensation matrix to the current one, then stopping for nozzle cleaning and repeating the sequence after user input. With no standard way to get user input on the Mini (no LCD or knob control), the idea never really applied to the mini (but might be something that could work with the Taz6, or other printers with click-wheel or touchscreen input).