Does the Microsoft Office LTSC Professional Plus 2021 Activation Key (Lifetime) Work for Full Activation?

I’m looking for a lifetime activation key for Microsoft Office LTSC Professional Plus 2021, and I found a guide online that offers this type of key. However, I’m not sure if it will actually work for full activation, especially with lifetime validity. Has anyone used this key for activation? Was it effective, or should I be cautious?

Here’s the link I found: Microsoft Office LTSC Professional Plus 2021 Activation Key (Lifetime). Does it provide a permanent activation, or should I look for another method?