Tiktok isn't an evidence based source of information. The person is a "Functional nutritional therapist" whatever that means. She might know something or she might just be a fly-by-night faddist pushing a theory that has no base. The article doesn't actually tell us who she is, and looking at linked in (https://www.linkedin.com/in/olivia-hedlund-0147a6116) she seems to be more into marketing than dietetics. Her nutritionist career is only 1 year old and I can't find any evidence of her assertion. Maybe just another example of an Influencer influencing the media and upsetting people.
So, I'd say if you want to drink coffee do so, in moderation of course because caffeine is a drug. If you are worried that hitting the stomach with too much acid first thing in the morning might be a problem, then tea also has caffeine and the tannin is acidic too, and the acid in orange juice is probably worse.
So, I'd say if you want to drink coffee do so, in moderation of course because caffeine is a drug. If you are worried that hitting the stomach with too much acid first thing in the morning might be a problem, then tea also has caffeine and the tannin is acidic too, and the acid in orange juice is probably worse.