yes but all those people also have devices at home. most of it around 5 years but that is hardly how long the hardware actually is usable especially if you use anything other than the bloated behemoth that windows has become.
reminder that you can get a 10 year old pc with an SSD and any linux disto that will perform as good or even better for most basic office work than modern windows 11 on modern hardware....
if you think a single medium sized organization killing 5 digit amount of perfectly usable hardware (these are average sized ~3kg desktop pcs) simply because of software is very little there is no argument that could convince you. try counting that up in your head only for your city (the whole world runs windows!) to decide if that is still "very little".
The numbers are only meaningful per person. If you want to multiply by 10K, you have to multiply their other waste too for comparison. Also I said laptop+phone originally, not desktop, in part because not very many people have desktops.
your arbitrary way to count will not change the actual amount of e-waste but it might make you feel better. you should be hired for corpo green washing.