Boil water in large pot with salt.
Cook pasta according to package directions.
Heat olive oil in medium saucepan.
Sauté garlic until fragrant, about 1 minute.
Add pumpkin puree to the pan.
Stir in plant-based milk gradually.
Season with sage, nutmeg, salt, and pepper.
Simmer sauce for 5 minutes gently.
Blend sauce until completely smooth.
Drain pasta and reserve pasta water.
Combine pasta with pumpkin sauce thoroughly.
Add pasta water if needed for consistency.
Garnish with fresh parsley before serving.