Hypothetically, if someone built their PC 3 years ago, and was an idiot and didn't look into why their PC/games crash slightly more than often, and system runs slower after being on for 3-4 hours, until recently where they found that their CPU runs at 70c idle and 99c under load, could that permanently damage the CPU permanently? As in, even with the thermal paste is getting replaced and cooler refitted tomorrow, has that hypothetical person just killed performance from their CPU permanently?
Say the hypothetical CPU was a Ryzen 5 3600 with no OC for context.