That sounds like an opinion to me...
Allow me to present to you what Wikipedia says (all referenced as always):
"Through late 1967 and early 1968, Barrett became increasingly erratic, partly as a consequence of his heavy use of psychedelic drugs such as LSD.[13] Once described as joyful, friendly, and extroverted, he became increasingly depressed, withdrawn, and began experiencing hallucinations, disorganised speech, memory lapses, intense mood swings and periods of catatonia. Although the changes began gradually, according to several friends —including the Pink Floyd keyboardist Richard Wright— he went missing for a long weekend and returned "a completely different person"
https://en.wikipedia.org/wiki/Syd_Barrett