Bring a pot of salted water to a boil and cook the pasta according to package directions until al dente; drain in a colander and rinse with cold water to stop cooking and remove excess starch.
While the pasta cooks, combine Greek yogurt, avocado oil, rice vinegar, maple syrup (or cane sugar), minced garlic, Dijon mustard, sea salt, and black pepper in a mixing bowl and whisk until smooth.
Add the chopped red bell pepper, red onion, celery, chopped dill pickles (if using), and chopped hard-boiled eggs to the bowl and stir to coat with the dressing.
Transfer the cooled pasta to the mixing bowl and toss everything together until evenly combined.
Taste and adjust seasoning with additional rice vinegar and/or mustard, and more salt and pepper if desired, then serve.