I've been running Win11 without a TPM for 6 years. Saying you can't upgrade isn't the same thing as Windows saying you can't upgrade. Knowing your OS seems to be a lost art. I'm not dismissing the valid complaint, but the title is empirically wrong clickbait.

The only Hard requirements are a CPU with SSE 4.2 and POPCNT. Win11 will simply not install on older CPUs. The rest of the requirements can be bypassed but Microsoft will block you from the annual major feature upgrades. You will have to do those manually too. They also claim that your stability and performance on pre-8th Gen CPUs will be degraded and they will give no support, but in reality it runs just fine. Win11 is sluggish on all CPUs anyway.

Win11 was released at the end of 2021. What were you running for 6?