No. That is a misused SEO term. You download the Emulator (1 file), the BIOS (1 file), and Plugins (multiple files). No single "plugin" contains a BIOS because that would be a legal violation for the emulator author.
You need game ROMs (ISOs). Because you downloaded a full BIOS and plugin, the emulator will now bypass the "no BIOS" error and launch your game. Download Psx Emulator Full Bios Plugin
The BIOS sits below the emulation layer, not alongside plugins. the BIOS (1 file)