All modules that call a Unix library contain WoW64 thunks to enable calling the 64-bit Unix library from 32-bit PE code. This means that it is possible to run 32-bit Windows applications on a purely 64-bit Unix installation. This is called the new WoW64 mode, as opposed to the old WoW64 mode where 32-bit applications run inside a 32-bit Unix process.
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Nextcloud’s biggest issue is performance, and PHP, while not a problem per se, doesn’t help. PHP is not designed for huge applications that need to have processes running in the background; it only runs when a request is made then stops the process, therefore it needs to load itself from scratch on every single page load.
This is because PHP uses something called CGI; the webserver (usually nginx or Apache) calls an external PHP binary to generate a page. With Go (or pretty much any other language), the app is its own server and can keep data in memory and do stuff even when no request is coming.