To add a bit more context: Its not as simple as “chronic lyme is fake”, because literally like 10% of lyme disease cases will have lingering symptoms after treatment. To distinguish it from quacks who say anyone with vaguely similar symptoms must have chronic lyme (even if there’s no evidence they had a lyme disease infection in the first place), scientists refer to it as PTLDS (Post-Treatment Lyme Disease Syndrome).

If the person actually had lyme disease to begin with, it may well be PTLDS symptoms, and may well be helped by a second course of antibiotics. If they didn’t actually confirm it was lyme though, or the lyme infection was years ago, it’s way more questionable. Their symptoms probably aren’t fake but they may well be getting taken advantage of by quack doctors, and making their health worse by continuing to take antibiotics for extended periods of time, etc.