It is the 64-bit version all the same as are all Magix Vegas Pros and Movie Studios starting from versions 14.
There may be errors in Support articles such as this one in this forum's German language Support NEW section: "Movie Studio und Movie Studio Platinum gibt es als 32-bit- und 64-bit-Version." That is outdated information.
(Sony Vegas Pro 11 was still 32-bit and 64-bit. Versions 12 and 13 were only 64-bit. Sony Movie Studio Platinums 12 and 13 had 32-bit and 64-bit versions.)