Desperate for Answers

I have a 2018 jeep Cherokee latitude, 4 x 4, it’s under warranty through the tigershark settlement case. it suddenly stopped turning over during the cold months in October. I brought it into the authorized Jeep dealership service department that performed the recall from the tigershark engines oil consumption. The dealership where my vehicle has been for the last seven months has told me that my engine did not fail due to oil consumption and would not be covered under the hundred thousand mile warranty extension and I would have to pay to have it replaced. They told me internally and blew a head gasket and this has nothing to do with oil consumption. They said my car overheated severely. This blows my mind because I am the only person who drives my vehicle and I did not get any signs of my vehicle overheating from the dashboard lights, the temperature gauges, or any physical smoke coming out of my car at all. I guess ultimately my question is could the oil consumption issue with the tigershark engine have caused my car to fail at 85,000 miles thank you any and all advice would be so helpful