I too agree that too much iol by that amount can cause destruction of an engine, the reasons already having been defined.
While I place the blame clearly and solely on the shoulders of the skippy lube, I’d like to suggest that in future whenever work is performed on your cars you double check the work to the extent practicable before leaving the shop, even if it’s just the fluid levels. One should not have to do this, but it can save you lots of aggrevation and even money in the future. Trust but verify.