As other told you this version is intended to be used on amd64 CPUs, which means the most popular 64 bit CPUs (both Intel and AMD).
The reason they don't provide ARM version of FreeBSD is because embedded systems are not the same and have different setup. Since Raspberry Pi is quite popular I can imagine that someone might build available to other for download but I wouldn't expect FreeBSD project do it (it probably would be someone else - I see link to images here https://wiki.freebsd.org/FreeBSD/arm/Raspberry%20Pi). If you have FreeBSD machine you can compile it yourself.
I'm going to guess not as it is marked as being compatible with amd64, you will need an ARM build (arm 6, I believe) for the Raspberry Pi. I'm sure a third party will eventually post a pre-compiled version somewhere fairly soon.
The reason they don't provide ARM version of FreeBSD is because embedded systems are not the same and have different setup. Since Raspberry Pi is quite popular I can imagine that someone might build available to other for download but I wouldn't expect FreeBSD project do it (it probably would be someone else - I see link to images here https://wiki.freebsd.org/FreeBSD/arm/Raspberry%20Pi). If you have FreeBSD machine you can compile it yourself.