Earlier quoted context omitted.
By that definition, anyone experiencing chronic illness symptoms "following" (said another way, "after") a Covid infection has "Long Covid" - even if Covid had nothing to do with those chronic illness symptoms developing or continuing. I think we need a better definition.
I think at this point diagnosing long covid necessarily involves trusting patients. If you had no chronic illness symptoms you were aware of, and then get covid, and then have chronic illness symptoms - that's long covid. Until we understand what it is better, there's not going to be any way to objectively test for it, or define it more clearly.
Why even have a study if you refuse to be more scientific than this?