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You have there two different things, FTT in vSAN is about how many esxi failures (that share the vm data) you can stand without loosing the vm data.
And FT provides you with 0 downtime in case one esxi fails.
So for example, if you enable FT with a FTT0 in your vSAN, and you encounter a problem with the disks/esxi where the VM data is placed. You will loose the VM even with FT enable.
Nice weekend man!