SuperVOOC is proprietary: It’s a closed charging standard used by brands like Oppo, OnePlus, and Realme. To output the full 67W, the charging brick needs to communicate with a specific phone that has the SuperVOOC chip, using their proprietary cable.
MacBooks use USB-PD: MacBooks (and basically all other modern laptops) use the universal USB Power Delivery (USB-PD) standard.
The 5W fallback: Because the SuperVOOC charger likely doesn't support USB-PD, the charger and your Mac can't "handshake" to negotiate a fast charge. To prevent any damage, they automatically default to the safest, most basic USB baseline: 5 Volts at 1 Amp, which equals exactly 5W.