Of course you need a PC to run the game, it is not Android based. You don't have the slightest clue what you are talking about. It takes more than "some minor adjustments to software" to port the game to Quest.
Porting a PC game to standalone VR requires:
- Rewriting rendering pipelines
- Reworking assets for mobile performance
- Rebuilding interaction systems
- Re-optimizing lighting, physics, AI
- Replacing PC-specific libraries
- Rebuilding the entire build chain for Android
This is months to years of engineering work, not a patch. Phasmophobia would require a full-scale port, major redesigns, and significant compromises - if it were even feasible at all.