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N, P and K all express as purple/red petioles first, it’s a very common symptom of nutrient deficiencies not specifically related to Mag. Mag (or Cal) will always express mid plant first, if it’s the lower petioles showing the issue first then it’s likely N, P, K.
We have to be careful when giving advice about nutrient issues as it’s a complex, nuanced subject and bad advice is confusing and makes the problem worse. That’s both why I started the thread “help us help you” and why I give very general, vague advice when people give general, vague descriptions about issues. Without enough info any guess is just as likely to cause more problems then fix existing ones.