If it is not a fan controller issue, what they describe is a silicon or silicon to heat sink issue. A momentary transient heat issue ("full throttle") should be fully absorbed by the cooling system. If it is not, that means either the heat can't escape the IC to the silicon (design failure) or the silicon can't transfer to the cooling system (no thermal compound, not properly installed or heat sink not properly attached). This is why running a modern amd/intel CPU without a heatsink is a bad idea. At least those have bulletin in throttling. Without that, they are instant toast. What they are describing is a serious issue.