How the hell are you putting NVMe into 2011 iMac? I'll do that immediately, and sure as hell this will be "very hot", to put that in relation.
This is about a SATA SSD in a mid 2011 iMac, and whether it gets hot when the temp monitoring is deactivated so that the HDD fan spins at default. This is what I am disputing, as this method is super simple to implement (e.g. using a SATA power splitter cable), and hence it should not be dismissed based on beliefs and comparisons that are not applicable, such as NVMe. If you believe this SATA SSD in a 2011 iMac gets hot with fan at default speed, please provide proof.