Microsoft Office Professional Plus 2021: Lifetime License for $49

I'm wondering, the page states:
Not that I don't trust Microsoft (sarcasm) but does this mean that the license key won't be good say in like 18 months?
I imagine that I install withing 30 days and I have saved the ISO on a backup too. Then in 18 months I have to re-format my C drive. Can I reinstall the suite and use the original license key again or will they make me buy it again?

I'm looking at this page:

Thanks

@walkngdude Correct, if you install it in the 30 days, then 18 months from now have to reformat/reinstall the license will already be attached to your Microsoft Account and should work fine.

walkngdude said:

I'm looking at this page:

Microsoft Office 2021 For Windows or Mac (Faculty/Staff Only)

store.thinkedu.com

Click to expand...

Wonder if this is an issue for non-students.